i had a new string installed on my bow in december, shot it a couple hundred times, had the peep adjusted and it was shooting well. the night before my first 3d shoot in march, the peep was suddenly way off so i hurried to my local shop and got it tweaked again. the bow was fine through the first half of the shoot then drastically changed so my shots were 10 yards low by the end of the day. after the tournament was over i took the bow back to the shop and showed them that the serving was separating already in the cams. they ordered a new string and installed it right away no charge. sometimes a string is just bad. if you trust your shop, trust them, if not, call them out on it and go somewhere else.