Yeah... I had the same problem, for years. Started when I was about 19, pulling apart 6 pac plastic holders, but I tried 2. I could feel my left shoulder pop out and back in quickly. Must have stretched the tendons on that day, because thats when I would have trouble , if I got the arm above my head, it would pop out. I would always put it back myself, but it got worse as time went on. Then I went on a skiing trip with some Buds.. I wasa novice, but they took me to the Diamond slopes... I fell and popped it out. I lay there for 25 mins, trying to get it back in. Thats when I decided to get surgery on it. So I looked up the Redskins Surgeon, and he operated on it in 1987. But I fear the tendons are stretching again , now...