The screen connector is right about in the middle of the phone on the left side, the internals of the 7 is nearly identical to the 6's EXCEPT in the 7's theirs no screw on the connections bracket that holds it down to the motherboard. Thats been seenbas a bad move by most, given your issue fits a bad connection, thats probably all it is.

Next time it does it give it some pressure in that area see if it goes back, obviously not too much. These are easy enough phones to open up, but if you dont reglue the exterior water / moisture could be an issue.

Watch a Pixel 7 teardown video, then watch one for a 6, it'll make sense what's most likely happening. I'd assume that was done to help, because the screw that holds that bracket down on previous phones is a fucking nightmare, but then this can happen.