Rarely do I ever put my jeep in 4wd, but I did today for about 1 min. After I took it out of 4H, I heard this squeaking noise. It stayed there for about 1 minute, then stopped. Also, when I put it back to 2H, it felt like the car didn't really want to move, like it was stuck. Is this because I don't use it very often? Or should I have the dealership check it out?