Does anyone have any thoughts on this (other than "it's gremlins" ) I don't want to deal with the dealership/loaner hassle if I don't have to.
1. Check for codes (key 3 times "on"-and-"off", then "on". Don't start car; if codes are present they will show). Alternately, some auto stores like AutoZone or Advance Auto will do a code check for free. If you get a code readout, go to Jeep Grand Cherokee WK - Diagnostic Trouble Codes
to determine cause.
2. Check all body ground connections that you can find for a loose one, particularly around the control modules. I think I still have a floating ground somewhere in the body that causes spurious on-off function signals. Can't reproduce the conditions and the dealer can't find the cause.
3. Didn't work for me, but you could disable all automatic functions in the menu for the user preferences and enable them one by one. It was a great idea that didn't yield any definitive results in my Yeep.
I know that this is not a great list to solve your issues, but they are a start for you to eliminate causes before the dealer gets involved.
Important things if you decide to go to dealer for repair/diagnosis: Prepare a letter in advance with everything that happened and the circumstances, then ask that the service writer attach it to the repair order. That way it gets to the technician who evaluates your car. This letter should have VIN, mileage, & date. Save all of your service receipts and staple a copy of your letter to it in case you need it later on.
I wish you the best. Let us know if you get a definitive cause.