i have same problem with ghost touch, though it seems it happens only under certain kind of unknown conditions. I think it might have something to do with moisture in air and/or some other unknown thing.

My FP4 got the opposite problem where it sometimes ignores inputs when placed on a soft surface.

But I guess I’d rather have that issue than yours.

I had ghost touches on my old Motorola. I never could figure out any pattern or cause for the problem. But a restart seemed to resolve it