My 737 has been doing rolls on the ground for no reason for a little while now. After about 2 minutes of running the aircraft it will start to bank to the right and roll around until it crashes. I have no idea why it's doing this. Does anyone have a fix for it, or no what's causing it to malfunction like this?

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Very weird, it must be a fuel related problem or something. I have absolutely no idea why it does this though.