Anyone else have this problem?

[shotguunar]

I think what they call it is stiction which is the scopes willingness to move after being adjusted until it is hit with a large amount of vibration research this i think this what you might be looking at

[Mauser]

Leupold will take care of it if it is a scope issue. I once purchased a used Leupold that look as if it had been used as a boat paddle. I called them and explained that if was purchased used and abused. When I asked if they would honor the warranty, the guy replied, "We made it didn't we?" Three weeks later it was returned and worked like new.