have a new 2011 commander 3 mounths old, im not a hard rider just trails, had it to the shop the first week because it went into limp mode, got that fixed , then back in for 10 hour servise check just last month, now im hearing a load clunking or knocking sound when i start out slow going in forword or reverse, now im going to have to take it in again!! any help, im not sure if its the rear diff. or something other than that