Give the rifle a thorough cleaning and check all the mount screws. Also while you are at it, check the crown of the muzzle for any dings etc. You can clean up the crown by using the Head of a large brass screw (half round head) and some polishing compound (can get at auto parts store) and chuck in drill and dress up the crown. You Tube should have some examples of this.
No such thing as a stupid question. What is stupid is not asking it.