Went out shooting Sunday and encountered some issues. First problem is I can't finely focus at any magnification and parallax most prevalent at 100yds. I can see my 1" square target but it's not clear at all. Second problem I'm having is with my zero stop. Just recently re zeroed and set the shims, but when returning to zero the stop shifted from .4 clicks past to 1.2 past. I was in a hurry so I didn't get to re check my zero but it's been bothering me. I contacted Vortex Thursday but no answer back yet. Are these valid excuses to get new glass?