A couple of weeks ago I was driving from Oklahoma to Texas on rural highways using cruise control; it was about 105*F. In the early (hot) afternoon, I tapped the brakes to disengage the cruise as I went through a small town, and then hit "resume." Nothing. I tried turning cruise off, then on and resetting....nothing. In the next small town I pulled over, turned off the engine, waited a few minutes, started again, and still cruise didn't work. Bummer.
Later I stopped for mediocre BBQ in Stephensville, TX -- the van was parked in full sun for about an hour. When I started up again, cruise control worked just fine for the final five hours of the trip.
I haven't taken the van on a long hot run since then to try to reproduce the problem.
Googling has not turned up any TSBs for the 2006 cruise control -- at least, not with my Google skills. Any ideas what might be going on? (I like to have a bit of a clue before heading to the mechanic.