USB connector connected/disconnected message keeps popping up

Hi,
I use a Samsung Galaxy Tab A8 (2021, 10.5"). Recently, 'USB connector connected'/disconnected message keeps popping up every second on my tablet whether I plug in the type c port or not. It also doesn't allow the screen to turn off. I've tried all the methods related to software functions available in the Youtube but failed to solve the problem.
Any suggestions, please? Thanks and regards.