My 2011 M8 Sno Pro just did it on Friday, almost the exact same spot as yours. I had 1100 miles on it at the time, rollers look fine, was not jumping, just going down a road with a foot of fresh on it. Felt a vibration, then grenaded. Had to be towed out by 09 RMK. I was able to get a loaner secondary for Saturday, sled at dealer now. I'm still under the first year of warranty, by three weeks, hopefully it will be honored.