I purchased a RPI4 and installed a 9.21 When I try to play ISO files (most of my library is ISO), about 10 seconds into play, sound and picture go blank for a couple seconds then resume. My old RPI3 running 8.? doesn't do this. All other file formats seem to work fine. Any thoughts about what I should do? Granted, it's not a major problem but it is a little annoying.
Thanks!