Quite a few will probably disagree with me on this but I've seen this problem twice (<I know , not enough to make a concrete case) and both times the problem was fixed imediately. I dont know what your case is , but in the two problems I helped solve , both of them had new bows that were flinging arrows alot faster than their old setups. In both cases they were shooting light carbon arrows at high speeds , one was shooting upper 280's , the other was shooting 305 fps. Both cases were used to their old bow speeds of 230's - 250's. In both cases we backed the poundage down 5lbs and one tried an aluminum arrow , the other tried a much heavier carbon arrow (<Beman ICS 340). Both of them were back to shooting the way they were before their problem started by the 3rd shot.

Call it what you want , but todays bows store ALOT of energy and can be VERY intimidating , which can lead to the problem your describing.