TV hang up cause?

Question

TVs

The Sharp LC-19LE320Ru-BK TV freezes periodically, after some time of operation, stops working from the remote control, ripples on the screen, sometimes a loud sound or no sound at all. I noticed a feature when sticking a flash drive into the usb port, the TV set does not turn on immediately, but starts to look down a little, only after a minute it can be turned on normally. I sin on the power supply board.