I used to have the same sort of problem with my old bow(happend twice). Bought a new mathews legacy and i'll tell you what the deer cant move fast enough.Nothing gets outta the way of these arrows. If the deer jumping the string is something that seems to repeat itself then its either definently time for a change or the darn indian gets buck fever so bad he shakes like a dog 5h!+in razorblades. Its alot easier to group them arrows 3 inches when target shooting.