Fun times!
I get the "4wd is disengaged" message regularly whilst snow wheeling deep snow in the 1500 too.
Also the front axle setup is quite weak. I busted my rear driveshaft on a trail last year and removed it to get off the trail in FWD. Going slight up hill on loose gravel/dirt the "safety protection" disengaged the front axle after 3 seconds of tire spin. I was locked front and back (you cant just lock the front) and had to winch to break over the humps.
This year at EJS I broke my rear diff and had to do the same thing. The FWD did better on the moab terrain but still couldn't stay engaged.
View attachment 27156
Towed it home in this trusty