screen all color up, remove ear speaker flex fixes it

• latest update-i try to put a paper to separate whatever that is touch, do not work, if i lift the screen and it works, maybe the metal teeth by the side.
• update-- so not sure about the ear speaker is the issue. Removed it and still issue.
• another update- by chance i open the phone when it was still on and when i have it open like a book, like how you should open it to disconnect the battery, at a certain angle, screen works, so it seems something is touch, where it should not be.

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so, my iphone 12's screen is all cracked up. Got a replacement, after using it a couple of days, the screen is randomly black out. put back the old screen but its all color up, like the screen is fill up with just random colors, mostly white. Troubleshot and figure out that removing the ear speaker flex and the screen is normal again.

Would this be the port or the flex thats causing the screen issue?