I searched the site for cruise issues, but didn't find something quite like this.
I rode my '06 RSTD for hundreds of miles in the rain recently. Once, it simply disengaged the cruise on it's own. No bumps, or anything. It would not re-engage. I turned it off and on several times, but nothing. I figured the rain had caused a short. However, an hour later I tried it and the cruise worked as normal.
Yesterday, I rode in perfect hot sunshine and it happened again. I was on the interstate, no vehicles around, right hand in my lap, feet on the highway pegs. Other posts suggested that the brake or something was brushed, but I was definitely far away from the controls (excepting the clutch). I was on a great road and the cruise simply disengaged. As before, the ON light remained illuminated as if it was working properly. With my previous experience, I turned it off, waited 15 minutes and tried again. It did work. Then, a bit later, it disengaged again, this time on a curve. Another turn off and wait, then it worked again with no further problems.
I saw in one or two first gen posts that the cruise is attached somehow to the vacuum system. I don't know if this is the case on second gen bikes, but I do know that a cracked hose and/or cap is a suspect in my recent backfiring issue. Could this be related?
Other ideas?
Dave