I'm betting lot of scope / gun problems are likely self inflicted.....I know I've inflicted myself on more than one occasion working on something I shouldn't have be it guns, cars, plumbing, electrical the list is long.
Being a Jack of all trades is hard.
Somethings are better left to Gunsmiths....I'll go out on a limb and say that scope set up and mounting is one of those things that the Average jOe shouldn't tackle after watching a few You tube videos.
I have run into several gunsmiths over the years who didn't have much of a clue about mounting scopes. Have seen several tighten rings so much they left a visible "waist" in the scope tube, and often the pressure prevented the scope from adjusting correctly. In fact one of those claimed that ALL Leupold scopes are bad right out of the factory, due to his ham-handed idiocy.
I've ran into my share of bad gunsmiths....sad thing is at any moment one can go.bad.
