Kirby G3 shuts off but if left alone, starts back up on it's own?

My Kirby acts as it if is overheating and shutting down during use. I don't think it is the cord or any of the safety switches because when it dies if you just leave it where it sits it will start back up on it's own.

Like I said, it acts as if it has tripped some sort of protection fuse for overheating or something.

I don't think it is the brushes either because there is no sparking and it runs strong with no odd noises.

Ty
November 2012