My left shoulder keeps popping out when I lower the dumbbells to my chest or even lower (while doing dumbbell chest press). Well, I think that’s what the sound and feeling is. I'm using light weights as I'm re-entering the lifting scene and even with light weights I feel my shoulder popping out. I never had this problem before during the year that I consistently trained. Should I be stopping before I feel this in my shoulder? Work through it? Anyone else experience similar?