Since no WK guy answers, i will give it a try.
When i´m not wrong this is a problem with the electronic shifter module. I heard about cleaning the shifter assy could help.
When i´m wrong, now all the WK guys will jump on my neck, but at least we get some more answers.
JEEP Grand Cherokee 4.7 Lmtd 2004
HID 8000K in low and fog / Quad Squad member
KYB Gas-a-Just shocks / Pirelli Scorpion ATR 245/65/17 - Transgo reprogramming shiftkit.