Many modules use soldered-on lithium batteries to retain system settings and user patches. Once these die (and they are dying now), the unit forgets its tuning, its reverb routings, and sometimes its entire bootloader.
💡 : CrisisGM3.01 is famous for its acoustic pianos and orchestral strings . If you find the file size too taxing for your system, look for the "CrisisGM 3.01 Light" versions which offer similar quality with a smaller footprint. If you'd like, let me know: What software or game are you trying to use this with? crisis general midi 301