One thing I have experienced in the past is that of making an adjustment and not seeing the result on paper until the second shot. Reticle was stuck and the recoil of the first shot bumped it to it's new setting. I have seen this on multiple different scopes and multiple brands, most of them good quality, mid to upper price point. Did a little work and research and discovered the biggest culprit of this is over tightening of the scope rings screws. Many guys come on to the screws and tighten them until they can't be tightened any more, I have found that with quality rings that are machined to the proper size, torque setting requirements are surprisingly lower than what most guys think. Somewhere from 15-20 INCH lbs is all that is required.
I am not saying this is the solution with the original posters issues, just saying I would look at all factors that I have bearing on before blaming the optic. I think far too many scopes go back for warranty when the real issue is operator error.