Is it possible to bend the blades on the tm31 while crushing ice? i was making sorbet for the first time and as i put the speed dial up it would stop each time i got to about speed 5-6 as though it was stuck or something, the sorbet turned out but i think i should have defrosted the ice a little before putting it in? and speed up gradually? but i am concerned if i bent the blade or not I can't really tell..? Help!!