Doesn't charge when on but charges when off but is in a loop

Just yesterday my tablet started to not charge at all when it was on, i tried different cords, adapters, all that, then i turned it off and saw that it can charge however its stuck on an infinite loop, first charging for a few seconds, then going off, and then on again, and repeat, getting no charge at all.

(Fyi i can still turn it on, and the piece where the usb cord goes in is getting extremely loose, meaning its coming out of its port.)

If you have any possible solution, please comment ASAP.