I asked this question last week and got this answer
“Hi! This is a memory issue, and happens when you have a lot of systems enabled. Try dissabling some or add more memory to GPU.”
I disabled some emulators and cleared it up right away.
you don’t have to delete all roms if you wanna disable an emulator. just rename the directory, e.g. if you wanna disable snes rename the folder
if you wanna enable the emulator again, rename it back to snes.
too bad this is a memory issue, hopefully this will be fixed somehow within the next updates.