Had one do the nearly the same thing. The vertical was good but windage was out by 7" if it went out, everytime. It was mounted in Conetrol rings. I thought it was a mate fiddling with it, as it seemed to only do it after he got his mitts on it. Replaced the scope never had an issue again.
Never dialled my one either.
Sorry if its not what you want to hear.
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