Display auto touch/ Ghost touch
I've an iphone xs 256gb..the display was changed and had no true tone but it was an original genuine display when i bought it..So one day i accidently dropped it and broke my back glass shell...After 2 or 3 months i started noticing my display was auto touching like the 'ghost touch' they say..So i got it replaced with another original iphone xs display again..... after 3 or 4 days my phone started that ghost touch yet again..it is currently running on ios 15.1..Please can someone help me..Is it a display problem or hardware problem