To the problem, is this all the time or just in 4WD? Also with diff lock open? Any clue as to how to reproduce (something that seems to set it off all the time)? Sounds like something in one of your differentials is binding (sounds like front/rear from your description, hence the question about 4WD). Don't know if it's just an adjustment or it's something going bad.
I would definitely query the dealer. I know some are not as good as mine, but it's good to get a complaint in early should it be something warrantable.
Not sure I can be of more help, but if you give more symptoms, I'll do my best.