I have an Excalibur Equinox and am having issues with POI shifting drastically or not holding zero. I sent the scope back for warranty repair/replacement thinking it was the issue however since having it fixed/replaced I am still having issues. Basically I will sight it in and after a few shots my POI will drastically change by like a foot maybe even more, like it won't even be hitting the arrow block any more. When I first got the crossbow, brand new, I had to use different targets for each bolt as it would put 3 bolts in the same hole at 50 yards. After the scope work didn't seem to correct the issue I thought maybe I had a couple bad bolts (big weight differences or cracked or bent or something) so tried sighting in and shooting multiple shots with just a single bolt, tried several to make sure I hadn't grabbed one of the bad ones, but still had the same issue, after multiple shots on bullseye, it would suddenly start missing by a foot or more. This is all from the bench so I'm sure its not me. Everything seems/feels tight with scope mount and limbs and everything. What else could I be missing? Any other ideas? I'm wondering if it's still the scope, maybe they sent me back the same one unrepaired, even though it came in a new box and with all the accessories which I hadn't sent back to them? Or possibly a cracked limb, could that cause such an issue? Thanks for any help.