My shoulder keeps dislocating

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I am 35, and I have had a problem with my shoulder. When I was 18, I dislocated my dominant shoulder in a rugby game. After 2-3 more I finally had arthroscopic surgery in my late 20's, but after a couple of years I noticed that my shoulder started to feel like it was slipping in and out again. I am wondering if there is anything that can be done to definitively fix this, as I am very active and this is getting in the way of the activities I want to participate in.