diff --git a/src/AutoCursorLock.App/AutoCursorLockException.cs b/src/AutoCursorLock.App/AutoCursorLockException.cs
index 8a4eb58..5998994 100644
--- a/src/AutoCursorLock.App/AutoCursorLockException.cs
+++ b/src/AutoCursorLock.App/AutoCursorLockException.cs
@@ -18,9 +18,4 @@ public AutoCursorLockException(string message)
         : base(message)
     {
     }
-
-    public AutoCursorLockException(string message, Exception innerException)
-        : base(message, innerException)
-    {
-    }
 }
diff --git a/src/AutoCursorLock.App/Models/ProcessListItem.cs b/src/AutoCursorLock.App/Models/ProcessListItem.cs
index 85432a6..e281c8e 100644
--- a/src/AutoCursorLock.App/Models/ProcessListItem.cs
+++ b/src/AutoCursorLock.App/Models/ProcessListItem.cs
@@ -19,13 +19,15 @@ public record ProcessListItem
     /// <param name="path">The path of the proceess' executable.</param>
     /// <param name="appLockType">The type of app lock.</param>
     /// <param name="margin">The margin around the window for the app lock.</param>
+    /// <param name="reapplyLockInterval">The interval in milliseconds before reapplying the lock while the window is in focus.</param>
     /// <param name="icon">The icon image of the process.</param>
-    public ProcessListItem(string name, string? path, AppLockType appLockType, AppLockMargin? margin, BitmapSource? icon)
+    public ProcessListItem(string name, string? path, AppLockType appLockType, AppLockMargin? margin, int reapplyLockInterval, BitmapSource? icon)
     {
         Name = name ?? throw new ArgumentNullException(nameof(name));
         Path = path;
         AppLockType = appLockType;
         Margin = margin ?? new AppLockMargin(0, 0, 0, 0);
+        ReapplyLockInterval = reapplyLockInterval;
         Icon = icon;
     }
 
@@ -49,6 +51,15 @@ public ProcessListItem(string name, string? path, AppLockType appLockType, AppLo
     /// </summary>
     public AppLockMargin Margin { get; init; }
 
+    /// <summary>
+    /// Gets the interval in milliseconds before reapplying the lock while the window is in focus.
+    /// </summary>
+    /// <remarks>
+    /// A value of 0 disables reapplying the lock.
+    /// The lock will only be applied once, when the window is first focused.
+    /// </remarks>
+    public int ReapplyLockInterval { get; init; }
+
     /// <summary>
     /// Gets the icon image of the process.
     /// </summary>
diff --git a/src/AutoCursorLock.App/Models/ProcessListItemExtensions.cs b/src/AutoCursorLock.App/Models/ProcessListItemExtensions.cs
index aff3bce..b1efa98 100644
--- a/src/AutoCursorLock.App/Models/ProcessListItemExtensions.cs
+++ b/src/AutoCursorLock.App/Models/ProcessListItemExtensions.cs
@@ -29,7 +29,7 @@ public static ProcessListItem FromPath(string path)
             .FirstOrDefault()
             ?? throw new AutoCursorLockException($"Could not find process for path: {path}");
 
-        return FromAppLockSettings(new AppLockSettingsModel(process.ProcessName, path, AppLockType.Window, Margin: default));
+        return FromAppLockSettings(new AppLockSettingsModel(process.ProcessName, path, AppLockType.Window, Margin: default, ReapplyLockInterval: default));
     }
 
     /// <summary>
@@ -52,7 +52,7 @@ public static ProcessListItem FromAppLockSettings(AppLockSettingsModel appLockSe
             bitmapIcon = new BitmapImage(new Uri("pack://application:,,,/media/question-mark.png", UriKind.Absolute));
         }
 
-        return new ProcessListItem(appLockSettings.Name, appLockSettings.Path, appLockSettings.Type, appLockSettings.Margin, bitmapIcon);
+        return new ProcessListItem(appLockSettings.Name, appLockSettings.Path, appLockSettings.Type, appLockSettings.Margin, appLockSettings.ReapplyLockInterval, bitmapIcon);
     }
 
     /// <summary>
@@ -66,7 +66,8 @@ public static AppLockSettingsModel ToModel(this ProcessListItem processListItem)
             processListItem.Name,
             processListItem.Path,
             processListItem.AppLockType,
-            processListItem.Margin
+            processListItem.Margin,
+            processListItem.ReapplyLockInterval
         );
     }
 
diff --git a/src/AutoCursorLock.App/Views/AppLockSettingsWindow.xaml b/src/AutoCursorLock.App/Views/AppLockSettingsWindow.xaml
index 14d03e6..7cffc5b 100644
--- a/src/AutoCursorLock.App/Views/AppLockSettingsWindow.xaml
+++ b/src/AutoCursorLock.App/Views/AppLockSettingsWindow.xaml
@@ -5,17 +5,18 @@
         xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
         xmlns:local="clr-namespace:AutoCursorLock.App.Views"
         mc:Ignorable="d"
-        Title="App Lock Settings" Height="300" Width="600">
-    <Grid x:Name="mainGrid">
+        Title="App Lock Settings" Height="400" Width="600">
+    <Grid x:Name="mainGrid" ShowGridLines="True">
         <Grid.RowDefinitions>
             <RowDefinition Height="Auto"/>
             <RowDefinition Height="Auto"/>
             <RowDefinition Height="Auto"/>
             <RowDefinition Height="Auto"/>
             <RowDefinition Height="Auto"/>
+            <RowDefinition Height="Auto"/>
         </Grid.RowDefinitions>
         <Grid.ColumnDefinitions>
-            <ColumnDefinition Width="Auto" />
+            <ColumnDefinition Width="*" />
             <ColumnDefinition Width="Auto"/>
         </Grid.ColumnDefinitions>
         <StackPanel Grid.Column="0" Grid.Row="0" Margin="5">
@@ -46,7 +47,8 @@
             SelectedItem="{Binding AppLockSettings.AppLockType}" />
         <TextBlock
             Grid.Column="0"
-            Grid.Row="1">
+            Grid.Row="1"
+            Margin="5">
             Left-side margin
         </TextBlock>
         <TextBox
@@ -57,7 +59,8 @@
             Text="{Binding AppLockSettings.Margin.Left}" />
         <TextBlock
             Grid.Column="0"
-            Grid.Row="2">
+            Grid.Row="2"
+            Margin="5">
             Top-side margin
         </TextBlock>
         <TextBox
@@ -68,7 +71,8 @@
             Text="{Binding AppLockSettings.Margin.Top}" />
         <TextBlock
             Grid.Column="0"
-            Grid.Row="3">
+            Grid.Row="3"
+            Margin="5">
             Right-side margin
         </TextBlock>
         <TextBox
@@ -79,7 +83,8 @@
             Text="{Binding AppLockSettings.Margin.Right}" />
         <TextBlock
             Grid.Column="0"
-            Grid.Row="4">
+            Grid.Row="4"
+            Margin="5">
             Bottom-side margin
         </TextBlock>
         <TextBox
@@ -88,5 +93,31 @@
             Margin="5"
             MinWidth="80"
             Text="{Binding AppLockSettings.Margin.Bottom}" />
+        <StackPanel
+            Orientation="Vertical"
+            Grid.Column="0"
+            Grid.Row="5"
+            Margin="5">
+            <TextBlock TextWrapping="Wrap">
+                Lock re-apply interval.
+                The interval in milliseconds the cursor lock should be re-applied as long as the application is in focus.
+                 Use this for applications that clear the cursor lock.
+            </TextBlock>
+            <TextBlock TextWrapping="Wrap" Margin="0,5,0,0">
+                Set to 0 to disable the re-application. This means the cursor lock will only be applied once, right after the application is focused.
+            </TextBlock>
+            <TextBlock TextWrapping="Wrap" Margin="0,5,0,0">
+                Small values may cause performance issues.
+                Large values may cause the cursor to be unlocked for a short period of time.
+                10-100 milliseconds seems to be a good range for most applications.
+            </TextBlock>
+
+        </StackPanel>
+        <TextBox
+            Grid.Column="1"
+            Grid.Row="5"
+            Margin="5"
+            MinWidth="80"
+            Text="{Binding AppLockSettings.ReapplyLockInterval}" />
     </Grid>
 </Window>
diff --git a/src/AutoCursorLock.App/Views/MainWindow.xaml.cs b/src/AutoCursorLock.App/Views/MainWindow.xaml.cs
index 02f888b..92a68b1 100644
--- a/src/AutoCursorLock.App/Views/MainWindow.xaml.cs
+++ b/src/AutoCursorLock.App/Views/MainWindow.xaml.cs
@@ -9,6 +9,7 @@ namespace AutoCursorLock.App.Views;
 using System.Diagnostics;
 using System.Linq;
 using System.Runtime.InteropServices;
+using System.Threading;
 using System.Windows;
 using System.Windows.Controls;
 using System.Windows.Input;
@@ -29,7 +30,8 @@ public partial class MainWindow : Window, INotifyPropertyChanged
     private readonly SaveUserSettingsOperation saveUserSettingsOperation;
     private readonly ILogger<MainWindow> logger;
 
-    private ApplicationEventSource applicationEventSource;
+    private readonly ApplicationEventSource applicationEventSource;
+    private readonly object activeProcessLock = new ();
 
     private bool globalLockEnabled = true;
     private bool applicationLockEnabled = false;
@@ -140,21 +142,29 @@ public ProcessListItem? ActiveProcess
     {
         get
         {
-            return this.activeProcess;
+            lock (this.activeProcessLock)
+            {
+                return this.activeProcess;
+            }
         }
 
         set
         {
-            this.activeProcess = value;
-            ApplicationLockEnabled = value != null;
-            NotifyPropertyChanged(nameof(ActiveProcess));
+            lock (this.activeProcessLock)
+            {
+                this.activeProcess = value;
+                ApplicationLockEnabled = value != null;
+                NotifyPropertyChanged(nameof(ActiveProcess));
+            }
         }
     }
 
     private IntPtr Hwnd => this.windowInteropHelper.Handle;
 
+    private Timer? ReapplyTimer { get; set; }
+
     /// <summary>
-    /// Gets the list of enabled processes.
+    /// Runs when the Window handle is available.
     /// </summary>
     /// <param name="e">Event args.</param>
     protected override void OnSourceInitialized(EventArgs e)
@@ -198,25 +208,35 @@ private void OnApplicationChanged(object? sender, ApplicationEventArgs e)
 
         ActiveProcess = UserSettings.EnabledProcesses.FirstOrDefault(x => x.Name == e.ProcessName);
 
+        // dispose previous timer
+        ReapplyTimer?.Dispose();
+
+        // set up new timer if needed
+        if (ActiveProcess is not null && ActiveProcess.ReapplyLockInterval != 0)
+        {
+            ReapplyTimer = new Timer(_ => AdjustLock(e.Handle), null, ActiveProcess.ReapplyLockInterval, ActiveProcess.ReapplyLockInterval);
+        }
+
         AdjustLock(e.Handle);
     }
 
     private void AdjustLock(IntPtr hwnd)
     {
-        if (GlobalLockEnabled && ActiveProcess is not null)
+        var activeProcess = ActiveProcess;
+        if (GlobalLockEnabled && activeProcess is not null)
         {
-            this.logger.LogInformation("Locking cursor to {ProcessName} {AppLockType}", ActiveProcess.Name, ActiveProcess.AppLockType);
+            this.logger.LogInformation("Locking cursor to {ProcessName} {AppLockType}", activeProcess.Name, activeProcess.AppLockType);
 
-            var border = ActiveProcess.AppLockType switch
+            var border = activeProcess.AppLockType switch
             {
                 AppLockType.Window => ApplicationHandler.GetApplicationBorders(hwnd),
                 AppLockType.Monitor => ApplicationHandler.GetMonitorBorders(hwnd),
                 _ => throw new NotImplementedException("Invalid AppLockType")
             };
 
-            if (ActiveProcess.Margin is not null)
+            if (activeProcess.Margin is not null)
             {
-                border = border.ApplyMargin(ActiveProcess.Margin);
+                border = border.ApplyMargin(activeProcess.Margin);
             }
 
             if (!MouseHandler.LockCursorToBorder(border))
@@ -328,7 +348,6 @@ private void RefreshButton_Click(object sender, RoutedEventArgs e)
                     this.logger.LogError(ex2, "Failed to create process list item for process: {ProcessName}", p.ProcessName);
                 }
             }
-
         }
     }
 
diff --git a/src/AutoCursorLock.Sdk/Models/AppLockSettingsModel.cs b/src/AutoCursorLock.Sdk/Models/AppLockSettingsModel.cs
index a20b021..04de8d9 100644
--- a/src/AutoCursorLock.Sdk/Models/AppLockSettingsModel.cs
+++ b/src/AutoCursorLock.Sdk/Models/AppLockSettingsModel.cs
@@ -10,11 +10,13 @@ namespace AutoCursorLock.Sdk.Models;
 /// <param name="Path">The path to the application.</param>
 /// <param name="Type">The type of app lock to use.</param>
 /// <param name="Margin">The margin around the window for the app lock.</param>
+/// <param name="ReapplyLockInterval">The interval in milliseconds before reapplying the lock while the window is in focus.</param>
 public record AppLockSettingsModel(
     string Name,
     string? Path,
     AppLockType Type,
-    AppLockMargin? Margin
+    AppLockMargin? Margin,
+    int ReapplyLockInterval
 )
 {
     /// <summary>
@@ -25,6 +27,6 @@ public record AppLockSettingsModel(
     /// <returns>The model.</returns>
     public static AppLockSettingsModel FromNameAndPath(string name, string? path)
     {
-        return new AppLockSettingsModel(name, path, AppLockType.Window, new AppLockMargin(0, 0, 0, 0));
+        return new AppLockSettingsModel(name, path, AppLockType.Window, new AppLockMargin(0, 0, 0, 0), ReapplyLockInterval: default);
     }
 }
diff --git a/src/AutoCursorLock.Sdk/Models/HotKeyModel.cs b/src/AutoCursorLock.Sdk/Models/HotKeyModel.cs
index 07d999b..76f8a58 100644
--- a/src/AutoCursorLock.Sdk/Models/HotKeyModel.cs
+++ b/src/AutoCursorLock.Sdk/Models/HotKeyModel.cs
@@ -11,13 +11,13 @@ namespace AutoCursorLock.Sdk.Models;
 public record HotKeyModel
 {
     /// <summary>
-    /// THe modifiers for the hot key.
+    /// Gets the modifiers for the hot key.
     /// </summary>
     [JsonRequired]
     required public ModifierKey[] Modifiers { get; init; }
 
     /// <summary>
-    /// The virtual key code for the hot key.
+    /// Gets the virtual key code for the hot key.
     /// </summary>
     [JsonRequired]
     required public int VirtualKey { get; init; }