It may not be the carburetor, if it starts and runs, than starts again after a few minutes it may be something to do with the engine heating up. I am not aware of the model but with older engines a faulty condensor could cause those symptoms, i have never experienced it with an electronic ignition.
A fuel line too close to the engine heating up and vaporizing the fuel is another possibility but it would not normally restart until it cooled for 15 to 30 minutes.
Air flow pushing the kill switch lead onto something, partially blocked crank case breather if it has one. I can see your going to get your money's worth out of this one.
