Top left of screen unresponsive *new screen*

Hello, I've recently replaced a full screen assembly using your screen repair kit and had an issue I need help with. Originally for a week or two the phone functioned perfectly however with the IOS 11 update it became completely unresponsive to touch. Now this is not the issue since a hard reset (power/home hold) fixed this issue. However shortly after and maybe unrelated but the top left area of the screen normally used to go back became unresponsive almost completely. While it sometimes works it doesn't always and being in the area of the phone you use to go back in apps like SMS it's a really big hassle. Any help on the subject would be very much appreciated.