FP4 Occasional touchscreen glitches + "taskmanager" button not working

Hi, for a few weeks, my FP4 from early 2023 has occasionally been seeing some phantom touches, i. e. it reacts as if I was touching the screen while I am not. Also, the “task manager” button (bottom right) does not react at all. Do you think this is an issue that can be solved by replacing the display or could it have a different root cause?