If you are the type of person who has a running commentary going on in their head all the time, you might exhibit the phenomena you describe. You must have a quiet mind to shoot well.
Ya, I have this going on.
Alan, go shoot some paper targets, it will tell you a lot about what's going on. Did you see my review of Red Star ammo? If you compare the four targets I seem to have a trend of 2 fliers and five in a good group. I know I'm losing concentration and I have no muscle memory for this discipline like I do with a rifle.
Practice, practice, practice.