I decided to wait a few days before shipping as all the Tam folks are at the NYC show. I took it to the Arb and the lake for a careful test to see on which side of the camera the problem lies. I tried good light, bad light, static shots, and action, near and far. I shot on both the d500 and the two 5300s, all on a tripod. I got 30 or 40 good pictures each day, but I was having to shoot 300 to 400 to get there. If its me, then I'm hopeless and need to take up knitting, but I don't think it is, so off it went today. I report back as soon as I hear something.