If you're in this game long enough, most of us have had a scope go bad.
I recently had a Bushnell Elite 4200 scope that would change POI laterally. I always assume it's me first, then something has gone sideways with the rifle, lasting the scope. What made this so frustrating is that it was mounted on my super accurate Weatherby Mark V, Super Varmint Master, a true sub 1/2 moa rifle - my Number 1 long range ground hog rifle.
After painstakingly sorting through this process, I identified the culprit, the scope. This was a $500 scope at the time I purchased it several years ago, not one of their "bargain" scopes. I am shooting it on a 223 Rem; thus, recoil is minimum. Also, I am hunting groundhogs in fields, not sheep hunting in Alaska. Translation, the scope is subject to virtual no shooting or field stress.
I sent it back under their lifetime repair policy and they "fixed" it. We'll see. It's terribly frustrating when this happens since I hate to waste components in isolating the problem, then having to resight a replacement or "repaired" scope then verifying the latter.
Never had a Leupold go bad yet and I have several of them. Surprised they didn't fix it right the first time. I guess like everything else in this new age world, nothing as it was in the past.