diff --git a/Sources/OpenKey/macOS/ModernKey/OpenKey.mm b/Sources/OpenKey/macOS/ModernKey/OpenKey.mm
index 1e6b6c14..16cc9ea1 100644
--- a/Sources/OpenKey/macOS/ModernKey/OpenKey.mm
+++ b/Sources/OpenKey/macOS/ModernKey/OpenKey.mm
@@ -68,6 +68,9 @@
     CGKeyCode _keycode;
     CGEventFlags _flag, _lastFlag = 0, _privateFlag;
     CGEventTapProxy _proxy;
+
+    //defined in OpenKeyManager.m
+    extern void OpenKeyReEnableEventTap(void);
     
     Uint16 _newCharString[MAX_UNICODE_STRING];
     Uint16 _newCharSize;
@@ -599,6 +602,14 @@ CGKeyCode ConvertEventToKeyboadLayoutCompatKeyCode(CGEventRef keyEvent, CGKeyCod
      * MAIN Callback.
      */
     CGEventRef OpenKeyCallback(CGEventTapProxy proxy, CGEventType type, CGEventRef event, void *refcon) {
+        //macOS turns the tap off if this callback misses its deadline (heavy system load)
+        //or after certain user input, and tells us through these two pseudo event types.
+        //Without re-enabling here, OpenKey silently stops converting until it is relaunched.
+        if (type == kCGEventTapDisabledByTimeout || type == kCGEventTapDisabledByUserInput) {
+            OpenKeyReEnableEventTap();
+            return event;
+        }
+
         //dont handle my event
         if (CGEventGetIntegerValueField(event, kCGEventSourceStateID) == CGEventSourceGetSourceStateID(myEventSource)) {
             return event;
diff --git a/Sources/OpenKey/macOS/ModernKey/OpenKeyManager.m b/Sources/OpenKey/macOS/ModernKey/OpenKeyManager.m
index 97883f1a..4ac82862 100644
--- a/Sources/OpenKey/macOS/ModernKey/OpenKeyManager.m
+++ b/Sources/OpenKey/macOS/ModernKey/OpenKeyManager.m
@@ -77,6 +77,14 @@ +(BOOL)initEventTap {
     return YES;
 }
 
+// Called from OpenKeyCallback when macOS reports that it turned our tap off.
+// Only this file owns `eventTap`, so re-enabling has to happen here.
+void OpenKeyReEnableEventTap(void) {
+    if (eventTap) {
+        CGEventTapEnable(eventTap, true);
+    }
+}
+
 +(BOOL)stopEventTap {
     if (_isInited) { //release all object
         CFRunLoopRemoveSource(CFRunLoopGetCurrent(), runLoopSource, kCFRunLoopCommonModes);