Bug fix: Emulator no longer crashes when leaving full speed mode

Desktop/Form1.cs

@@ -65,6 +65,7 @@ namespace Desktop
             if (_isRunning) return;
             _isRunning = true;
             _isPaused = false;
+            bool wasHighSpeed = false;
             Task.Run(() =>
             {
                 try
@@ -102,6 +103,19 @@ namespace Desktop
                         int elapsedTStates = (int)(_cpu.TotalTStates - tStatesBefore);
                         _tapManager.Update(elapsedTStates);
 
+                        if(highSpeed)
+                        {
+                            wasHighSpeed = true;
+                        }
+                        else if (wasHighSpeed)
+                        {
+                            stopwatch.Restart();
+                            fpsStopwatch.Restart();
+                            scanlineCount = 0;
+                            audioSampleCount = (long)(_cpu.TotalTStates / 79.365); // Snap audio to the current T-State time
+                            wasHighSpeed = false;
+                        }
+
                         //Process audio at the correct time
                         if (!highSpeed)
                         {