It's D5500. Now and again, when I push the button to kick in the autofocus, it goes crazy, focuses in and out a couple times and generally lands not where I want to focus. It's way OUT of focus.
I've tried cleaning the lens and the sensor, cleaned any filter that I have on and checked for things like twigs foreground of the field of view. If it doesn't settle, after a few choice cusses, I turn off the camera, retract the lens to it's "off" position and then restart.
Any clues as to why this would happen?