Ok, I don't have access to my ds at the moment, someone try the following codes, to stop the freezing aswell as the black screens, it may not completly destroy the issue, but it should help significantly
D2359C44 E1A00000
D234FA80 E1A00000
D20DD9E4 E1A00000
D20D3820 E1A00000
D2359C44 E1A00000
D234FA80 E1A00000
D20DD9E4 E1A00000
D20D3820 E1A00000