I had a torch also. First few days it was doing well, then it started closing up on me until it died. I've had different opinions on torches, but it seems that they tend to be difficult to keep, but at the same time some people have had great success with them, so who knows. Did you add fresh water in an area close to the torch? Or have you added anything around the area of the torch, such as additivies or anything like that? I know mine was really sensitive, anything that you added that was close to the torch, it would make it go crazy, close real quick.
Also, does or did it have a lot of flow? If there's a lot of flow, that can cause them to close up. Other than that, not sure what else it could be.