Cruise Control

The cruise control on my 2004 chevy cavlier works for about 5 minutes and then just kicks itself off. Before I pay a $100 just for an electrical diagnostic any other ideas for what I should check. I’ve already checked fuses and someone at Autozone said it could just be a problem with the switch? Thoughts?

Check the third brake light. A burned out bulb disabled the cruise control on my 93 Caprice.

Ed B.