touch keeps going after screen change

hi I have changed a screen on a iPhone XR, have used the supplier and XR screens before and never had a problem. the phone was working fine, then after 4 days the customer turned the phone off and then touch stopped working. I did a force restart and the touch works fine, once the phone is turned off the touch stops responding again. a force restart and it works fine again. everything seems fine, I also used a icopy to copy over from the original screen. cant find what I am missing? any help pls