Nintendo switch lite freezes randomly

I was playing my stepson’s switch lite and it just shut off. It wouldnt respond to any button presses. I took it apart and found a spot on the board that has a little corrosion on it and cleaned it off. Put it back together and it working now. But now it will just randomly freeze, sound cuts off and button presses wont do anything. Only thing I can do when its frozen is hit the power button and hit it again and it works untill it randomly freezes again.