Re: 2006 GC funkiness. diagnosis?
I had a similar problem with my '05 before. It ended up being that the battery was bad. Had it replaced and the problems went away. Seemed that the '05's were very touchy when it came to battery voltage. I also had the battery replaced twice in two years so I'm not discounting that there were other electrical "gremlins" in that thing. I also remember reading something about a wiring harness issue within the steering column that was causing some problems for some people.
2014 Grand Cherokee Limited 4x4 V6
Bright White Clear Coat w/ Morocco Black Interior
UConnect 8.4AN AM/FM/BT/Access/NAV
Luxury Group II, Trailer Tow Group IV
20-inch x 8-inch Aluminum Wheels