Sometimes when Carplay is displaying some other app and I switch to Longplay, I loose the ability to control the screen. No widget is highlighted as I turn the selection knob on my Mazda3. The touch screen also doesn't work (assuming I stop the car which is required for touchscreen activity on the Mazda) If I manually press my back button on the Mazda I can return to a previous app where I will have full control of Carplay again. Returning to Longplay still has no control.