Pontiac G6 GT 3.5 and cruise control only works 1/2 the time?

I have a 2007 Pontiac G6 GT 3.5l and half the time the cruise control does not work. Sometimes I can be driving fine and the cruise control works no problem. But half the time it won't come on at all. What could be wrong? I have noticed sometimes that if it is not working if I do a "brake check"... show more I have a 2007 Pontiac G6 GT 3.5l and half the time the cruise control does not work. Sometimes I can be driving fine and the cruise control works no problem. But half the time it won't come on at all. What could be wrong? I have noticed sometimes that if it is not working if I do a "brake check" (ie slam on the brakes) it will start working.
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