Why do I keep having Hands Free Orgasms?

Hey all. I've finally registered, and I'd like to quickly thank all of you who have put so much heart and effort into this community.

With that said, I've had an Aneros for about 5 years now, starting with the helix, which I only used off and on with mild to no results, and a few months ago I moved to the Progasm, which really advanced the cause dramatically. I also added Alana's Hypnosis to the mix and I've been having excellent results. One issue is that I seem to be stuck having, after a few rounds of pleasure waves (I'm not sure what to call it, but they feel GREAT!) hands free ejaculations. It feels awesome and is quite powerful, but I think there's more to be had if I can keep this from happening and go deeper into the sessions.

Am I doing something wrong? Any tips on how to work around it?

Thanks!!