bonehead

2004 vette cruise control, knocks off, after 3 hrs smooth interstate driving. Sometimes traction control follows in an out. I am sure, not touching brakes or button controls. let it cool 30 minutes, works fine. But intervals seem to get shorter. NO trouble codes in D I C . Car garage kept, only 28000K miles. Two vette dealers have checked car.NO HELP ! Any ideas helpful !!!!!