Screen auto typing and opening closing apps

Hi,

Changed the screen on an iPhone 8. When turned phone on for the first time it was fine, only thing was screen was very dull with a yellow tint. Cleaned up the connectors on logic board and turned phone on again. brightness was good, then after a while screen started playing up. During boot and iphone logo there is a tint (Line) the height of the apple logo in the middle of the screen. The tint runs from the left of the screen to the right exactly through the startup logo. It is like a shadow Then phone turn on normally with no line. Then starts playing up.

New screen ghost types and opens and closes apps.

Checked the screen connectors on the logic board. Cleaned them up with 99% Isopropyl Alcohol, checked for pin damage under microscope and logic board damage. Found none. Checked the logic board for missing caps or filters. Found none. Check flex cables on screen they look fine.

What could the issue be?

I have ordered another screen to check if its just a faulty digitizer on the new screen. But I wanted to ask if anyone has had issues with it being the U3600? and if the U3600 is changeable or is it locked to the logic board?

Any thoughts?