I got the same problem! Everything worked fine,I played mame, md, snes and c64 games without problem, then I didn't use my system for 2 weeks (pi3b+ with roms in an usb stick inside a pandora case) and now I can't start any game, and the system even does not shut off, but freezes (see the pic)0_1582914932349_IMG_20200228_185110_resized_20200228_073310000.jpg