2001 Malibu and the Cruise Control shutting off.

I have a 2001 V6 Malibu that the cruise control keeps dropping off. When this happens you will see the RPM jump a bit then the cruise shuts off. In the past I have replace a break pedal switch and the problem went away for a year and a half. Well the problem is back and I have already replaced the switch and the problem is still happening. Anyone have any other ideas, and I have tried the Mass Air Sensor as well.

Thanks,
D

My 2001 Malibu had a brake switch which activates the brake lights and immediately adjacent to the brake switch was the cruise control deactivate switch. The cruise control deactivate switch was to sensitive to vibration and the switch would bounce causing the cruise control to deactivate. I had to bend the contacts in the cruise control switch so they weren't so sensitive to vibration even though the dealership tech said the switch was operating normally. That's been 3-4 years ago and it still works.