I would say the tiny (and I do mean TINY) little catch that keeps the rest up must have broken. I had similar experiences as yours. The rest worked great, shot great. Then it would "hang up" every once in a while. I tried to increase rest tension, and that helped for a while, but then it would hang up again. You can tell if it hangs up because you will hear a slap when the arm hits the riser, and your fletching will show signs of contact. I finally took my rest completely apart, and removed the tiny catch mechanism. The rest now functions much like a Trophy Taker, but drops every time and shoots great, just like it used to.