I had the problem when I first started shooting 2 trigger guns. I became more concious of hand position and the problem went away.

My wife, Cherie had the problem arise after taking off from shooting for a while. She had never had the problem before and was shooting the same gun.

I bought her one of the Galazan gadgets and she used it for a while. She then took it off an doesn't need it anymore. I think it is simply a matter of hand position.