Shameless plug, but I'm selling this one with nice accutac bubble level rings and Butler Creek caps:
https://www.midwayusa.com/product/559396/bushnell-elite-tactical-dmr-rifle-scope-34mm-tube-35-21x-50mm-side-focus-1-10-mil-adjustments-first-focal-g2-mil-reticle-matte
happened to me too. i find that if I mount it to a cold barrel it is more likely to happen than warm barrel. i keep all suppressor tools with me at all times just in case, but have never had this issue on a warm barrel.