picked up the Gren Saturday, really impressed until today. decided to try the center diff (worked great), then the lockers(not good). I have the "rough pack). rear engaged fine, front would not. went through all the normal stuff, ended up with error messages for both front and rear. called the dealer, was told to try applying the parking brake , which I did and was able to get both front and rear to engage. tried again 45 minutes or so later, rear engaged front wouldn't. disengaged the rear, flashing red diff lock icons for both, wouldn't clear even after disengaging center diff. rear diff and front diff error messages, only clear after the vehicle has been shut off for several minutes. anyone else dealing with this?