Dont know what is wrong but I have to sight it in After every shot can here a clunking when tilt it back and forth . Then it goes away for a couple of weeks and then comes back again . It is an older bushnel 4x12-40 . Is it worth sending to bushnell or would it be cheaper to buy a new one . Going to put my 6-24x50 mil dot bushnell on it now instead . It has been a good scope for 5 years but maybe everything must come to an end. Noticed today that the bottom cross hair on the scope is broke as well . Took it apart and noticed it was like a string in there . Is this how allscopes are I though the mil dot ,crosshairs where on a glass lens .