i have had several VX series leupolds, that's primarily what i owned for years, i don't think i have ever had one hold zero.... i couldn't count how many times i have went to shoot and having to re-zero after the first 3 shots.... it was just something i always accepted thinking that's how it was.... i would say more often than not i was making an adjustment to any given scope.
my last one i pulled off the talleys a couple times, re mounted and re-torqued because it was so bad i figured it had to be the mounting system.... it now lives on my CZ 17hmr, and is the same story on that rifle.... not as big of a deal on a sage rat gun, but may send it back just to see if i can get it to be a little more reliable... i would bet money that it's 1-2" off as we speak, because the last time i shot it was up a gravel mountain road, and it had to ride back down the mountain to get home.
never had one way off with normal use, but 1-3" off zero @ 100yds is pretty standard between shooting sessions.... i have literally never owned a scope that held zero for it's life, my swfa has been flawless so far, but i haven't even had it a year, way early to tell of course.
a friend of mine has a vx-6 he's had good luck with the past couple years, but i will ask if it's lost zero at all, he does a lot of 500yd-1k yd shooting, so it would be obvious, and i haven't asked, i just know he likes it.... he certainly isn't hard on that rifle though
i will never buy another leupold anything, because they have never been confidence inspiring for me. i could be easier on my gear, but i'm just not....