The first thing that pops to my mind is grease,grease,grease. There are zerks at the pivot point of the turret and usually two of them quit taking grease. Grease with the auger out(you might have to help it) and then grease with the auger in. It might take several times. This might not be your problem, it might be an electrical problem,maybe the limit switch on the saddle or the limit switch on the turret but greasing will more than likely be the fix.