Had drive train serviced two months ago. Drive train has been working fine. No weird noises or anything. Yesterday I took my truck into camp and had to use 4hi to turn around in 8" of snow. I parked the truck and shut off with it still in 4wd hi. Returned about 5 hrs later and when I started it up I got service 4wd on the display. I looked at the transfer case electronic control buttons and noticed none of the indicator lights were on and when I tried pushing different ones nothing would change and the truck was stuck in 2wd. After a few miles the display then read check coolant level. Level is fine. Something going a little haywire electronicly? Are there any fuses gone bad that could cause this to happen? I'm still stuck in 2wd.