The problem is 100 percent the sleep mode patch. Mother 3 is incompatible. Try this. It wont fix your issue, but it saves alot of time. Download vba-m for your pc, and after you sleep mode patch a game, try running it in the emulator. When i patched mother 3 for sleep mode the emulator gave me a white screen so i didnt even bother injecting. The only way around this if someone could make modifications to the agb firm to support sleep mode, but i doubt this will be done. Pokemon games also have this issue btw. All of them.