Hmm… since chargers work with galvanic isolation to generate the voltage conversion from 230V to 5V, they can’t really be earthed. There is no contact to PE (protection earth). I don’t think it has anything to do with that either.
Otherwise, the screws are not really loosening, but the metal is simply moving, just like the plug connections. I can therefore only recommend removing the display and pressing the cable at the display connection once again. That can be enough.
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