Id check these every year. I was pulling a good hill WFO on my m1000 mod cutting left and right when my left ski dipped into the snow I stopped instantly and flew over the bars about 20 feet, and had this waiting for me. We walked that hill in my line, looking for what ever I hit to cause this. We found nothing,but I saw my ski boot rubber missing. I can only think it somehow fell out which causes your ski to flop forward and act as an anchor when it hits the snow. I only lost 1 day of riding from this on my trip but it still sucked azz riding this out 25 miles from the back country .