Nikon scope question.

Hello Gentlemen,
I bought a used muzzleloader about 3 years ago. 1 yr old at the time. Topped with a Nikon 3x9 prostaff scope. I have shot it many times both in practicing and hunting. The crosshairs are suddenly "fuzzy". It still is accurate but there is something wrong and it will get worse. Heres my question.....it was probably built to be a riflescope and not a muzzleloader scope. If I send it to Nikon they will probably repair or replace it but over time with the same application it will probably fail again. I have other nikon scopes and they are excellent to me. Anyone here have any experience concerning this.
J_T_B

LAST EDITED ON Jan-23-19 AT 06:51PM (MST)[p]did the lockring on the eye piece come loose and the eyepiece screwed in or out???? recoil breaks the crosshairs....it doesn't make them blurry....readjust the eyepiece then tighten the lock ring.






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I tried that. Will double do it. Thanks
J_T_B