One of ours did that when we went to Denver and ran into snow. Turns out we drove too fast through the snow and they said they had to replace the rear clutch.
What was "too fast". I could find nothing under the AWD section of my OM regarding this.
There is a statement in the winter driving section that says " When driving through deep snow, turn off the traction
control part of the StabiliTrak® System to help maintain vehicle motion at lower speeds. "