@DavidEccleston for the problems I was having before I sent it in across the board there were inconsistences. For what I was describing when I got the R5 back from service I was using the RF 70x200 usually at 200mm shooting at or near wide open. I had it on the 4 setting for tracking and face eye detect for an animal. The pups are field trial stock and these two are especially fast, neither is the slow moving lopping lab you usually see. So they are tough subjects. The R5 picked them up instantly running away and held on their butts. When they hit the brakes I would loose several frames the camera couldn't compensate quick enough. I had several shots that the dog would blink, and it was odd because the camera would go slightly OOF when it did this but immediately catch up. They were anywhere from 30 to 50 yards away when they stopped and picked up. Overall I think it did great, most people do not go out and try and push their camera to its extreme limit.