Again, I have no issues with it disabling itself in the rain. At all.
What it should do, however, is reset itself when the conditions improve. It apparently doesn't do that.
I had the car at the dealer on Wednesday, and they agree that the owners manual implies it will re-set. However, unless it is raining/snowing and they can drive it, then drive it in acceptable conditions long enough to see if it resets, they cannot test it. (Which makes sense)
There are no TSBs on this.
My next test, and who knows when I will be able to test it, is to see if it actually does reset if you leave it on but alone (i.e. not switch it to normal to get regular cruise back) long enough.