Grand AM :: Cruise Control Quits Working Randomly While Going Down The Highway

My 05 Grand Am has about 75,000 miles on it. It has been a good car minus the occational strut mount replacement and front wheel bearing assembly. This cruise control problem has been going on for a couple years now.

It will just randomly quit while i'm going down the highway. Sometimes it wont do it for weeks, or sometimes do it 10 times in a 30 mile drive. Sometimes it will resume after i press the button once, sometimes i can hit it many times, sometimes it just seems to quit for a minute or two.

The wife and i took a 3 hour roadtrip this weekend and i was fuming after hitting the resume button dozens of times. We had alot of interstate traffic to dodge, alot of people on my butt. Thats not the greatest time for the cruise to be having problems.

She had it at the dealership right before the warranty was up and they said they "think" they know what it is, but their insurance company wont let them just change out $500 parts just because they "think" it's that part. I didn't hear about this at first from her or we would have made them fix it. What good is a warranty if they wont fix the problem you have?

I was hoping this is a common occurance with an easy fix. I am pretty good at working on my own vehicles so i can check certain parts if need be. What seems to be the most common problems to check when your cruise control has these problems?