The only thing I can think of is that the soldering for the charging socket on the daughterboard has gotten loose after drop meaning it would require soldering. But if it’s working just by loosening the screws a bit, you might be able to just leave it like that and use it for now.
You can take it to a phone repair shop to get them to fix it for you, luckily this model does not require prying up the screen to get inside the phone.