I have been using S22 ultra Model -SM-S908UI, after updating it to ONE UI 7, I am facing ghost touching problems in the bottom part of the device, it seems someone is touching it (Back and Home). It runs just fine for 5 or 10 minutes after restarting the device, but the same problem occurs. 

What I have done so far:

1. Factory Reset 

2. Accidental Touch on

3. Touch Sensitivity Off

4. Double tap to wake up off

5. I do not have any Screen protector ON. 

Please help me out. 

Thanks