No Touch after screen replacement
So I'm a cell phone technician, and this has me confused. I repaired a woman's iPhone 6, and supposedly it worked fine for 2 days. They, she comes back in and says that the screen stopped sending touch. I have plugged over 15 screens into the phone, they all work for about 30 secs, or until I press on the connections. I am just wondering if this is an issue with the digitizer connector, or if it's an issue with the touch controller ic. Thanks
Is this a good question?