Touch screen unresponsive sometimes
I have a 5s, that has had a U2 IC replacement (done by someone else), that at random times will stop responding to touch. The odd thing about this problem is that it can be immediately remedied by holding the home button to activate siri and then pressing the home button again to close it. I've cleaned all the connectors and tried multiple screens and done multiple hard/soft resets. The siri thing led me to believe it could be a software problem so i updated from iOS 10 to 11 but the digitizer still stops working after awhile.
Could this be the touch screen ic or digitizer fpc connector, and if so, any way to narrow it down?
Is this a good question?