My first thought was low fluid too. I had a mechanic service my transmission 2 years ago and it was fine until winter when the temperature dropped. When I first started the Jeep in the morning I could back out of the driveway but would get nothing for about 30 seconds after I put it in drive. Then it would kick in and drive normally. I took it back to the shop and they hadn’t followed Mopar directions using a special graduated dipstick and a temperature reader to dial in the correct amount of fluid. It was down a quart at least. Once they corrected the problem it has been fine ever since.
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2008 Liberty Sport 4x4 Automatic
Jeepin By Al 4" Lift Kit
BFG KO2’s 245/75R16
Full MOPAR skid plates
Rock Lizard Skink Super Sliders
AtTheHelm Front Recovery System & Roof RackM116A3 Trailer build thread: viewtopic.php?f=72&t=77997