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This is kinda way out there. But I just had this same problem with my MP5. It happened really slowly. Then just died on me and gears seized up. Turns out the axle on the bevel gear started to slip out from the gear. I thought they were one peice but turns out the bevel gear is two parts. Ok not likely that thats going to be your problem.
But did you take the mechbox apart to see what the problem might be?
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