I took out some guns I haven't shot in years. Of course they were were all off. After adjusting back on after a dozen more shots, I was basically back where I started on the recticle adjustments. Combination of brands.

I think RR's idea of exercising the springs is correct. I think from now on if I take a gun out I haven't used in a while I might move the recticle 12MOA back and forth and see what happens.