Nightforce problem

[RH300UM]

I have a 5.5x22x50 NXS with Zero stop. I had problems with mine last year. POI would shift wildly at any given yardage.
After checking all the obvious and normal causes of this nothing was found.
I contacted Nightforce. They said to ship it to them so they could take a look at it and test it.
THEY FOUND A DEFECT IN THE BONDING AGENT that locks the ring that holds the objective lens in place. There was a void in it. Every time the temp. would change so would the POI due to expansion and contraction.
They corrected the problem and all seems good for now.
I lost a lot of confidence with this scope and will always wonder if it will repeat.