Liftoff!

Same here. It happens if I use it for more than 20 minutes or so. Entire system ui crashes and freezes everything... no touch screen response or buttons work. Clearing cache makes no difference. It still crashes after being cleared

Try disabling Smooth Display, or similar, in device settings. That worked for me in Android 12 for Liftoff and a few other apps like Thunder and Firefox Focus.

Clear the app caches.