i am doing alot of shooting lately to get ready for oct 1st - i've been out of the game for a while! anyway, after about 3-4 shots the string twists(i guess ) and i get a string in my field of view through the middle of my peep! i can move my nock loop back around and solve the problem, but 3 more shots and its back!! is this normal?is there something i can do? do i just have to live with it?