I own two of those scopes and one of my friends has a couple. Neither of us has ever had a problem. He's using one on a .338 Laupa and a couple of AR's. I'd try another scope and see what happens. That will quickly rule in/out if it's the scope. Even Leupolds can have a problem once in a great while (actually, I've never had one Leupold fail and I have a LOT of them). Good luck.
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