Dont know what is going on. Ive got a Mathews Switchback XT that i bought in 2006. Ive been shooting this thing with one pin out to 30 yds for the last two yrs. Well put a new sight on it and took it out to tune it in and got the pin set at 20 yds but when i dropped back to 30 it was 6 inches low. Never seen a bow drop off that bad before. Worked for the last two years so i dont know what on earth is going on. Took it to the shop and the guy said he had never heard of it. Theyre gonna put a new string on it and check to make sure everything is in spec. Hope they can get it lined out.