i dont think it has anythng to do with the serving or string. i have a hoyt and have had the same problem. before that i had a bear instinct with the same issue. what the shop thought the problem was when pulling to full draw, we tend to pull on the string a little harder to get it to full draw causing the string and the cam to hit each other harder forcing the serving to loosen. after a while it will get worse. getting a newer string will still do the same thing. thats what the shop dsif. what i did was contact hoyt and no problem fixed because the problem isnt that bad. i did my own surgery making the gap where the string goes in a little smoother and alittle wider with a dremal and file. i notice there was a little sharp groove in the cam. thats how the cam was made. i beleive thats what made the serving fall off. have someone pull your bow and watch the string go around the cam and find the sharp edge. now it works fine. i dont recommend anyone to do what i did, but if the manufacture is not going to fix it i will myself. i still have the same string that it happend on the bow. i also fixed the serving.