Cruise control

My wife drives a 2003 Silhouette with about 30,000 miles on it. The cruise control goes off sometimes while we are driving. The dealer has had it for over a week and can't find the problem, they replaced the cruise switch, checked the brake switch, and checked the brake light sockets. Has anyone had this problem before?

Take it to another dealer. Looks like its still under warranty.

It ended up being caffed wiring on the back up warning system. Turn the warning system off and the cruise should work.