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To be honest if I had a tool that vibrated so much it broke itself I'd replace it with one that was better designed. Hand Arm Vibration Syndrome is a painful, life changing condition and one that better designed tools protect you against.
Bobbo-
To be fair, the wire that is breaking is about the thickness of a human hair. I think it just work-hardens as the result of millions of tiny movements and then fractures. TBH, I think those tools are incredibly useful for some things, but there are better tools for most things and they're also incredibly noisy, so I don't use mine much.
Aha! @Trunkie I found the repair vid, although it's in Russian. @Bobbo the broken wire is shown at about 2:30.
ffm
I'm sure there's many reasons why they can fail, but if it appears completely dead it could be that the vibration has caused the very fine wire that forms the motor windings to break between the circuit board and the motor. There's a bend there that can be a weak spot. That wire can often be resoldered, although you may need to take one turn off the motor to have enough slack to do so. I've saved my Bosch this way, twice.