Depending on the version you have, did you make sure to follow instructions with the roms? 1.10 or below and going over 100 games (I personally only have 80, including original 30) will probably C8 you. 1.11 or higher and you can put up to 700 games as long as you restrict roms to 30 per folder. I also recommend keeping the default setting of image resolution of box art on, since it keeps them to about 80k in size. The original issue wasn't the size of roms or how many you have, it's that the system can't handle loading so many images and would crash. Keeping the size low allows it to load normally if you're not using folders.