Electrical controller not working
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Hmmm well with what you describe I wouldn't wonder that there is some problem with the drive train? I would think, that a pulley, or gear or the like has come loose, most likely the shaft securing bolts? and is wobbling & binding while rotating? This then would cause extra current to be drawn from the battery and controller, and would then most likely trip the overload protection of the motor controller?
If you can DIY, then I guess the first place to start is there at the Drive Train. look for anything wrong in this area? Then either tighten it all up if possible or replace the broken or worn out parts? However to do any of this I imagine one would also need a service manual, accordingly you would need to obtain one, a Google search, use the exact make and model and the words... service manual.... That may provide one? Or a direct approach to the manufacturer?
However IMHPO, you will be most likely best served by contacting a professional, contact the manufacturers or agents head or local office and ask for a referral to their authorised service center persons? and getting them, to at the least, give you a "Quote' as to what's wrong, and how much it may cost? After you have all this information, then one can ,make up ones mind as to what to do, repair or replace?