Did you ever find a solution for this? This happened to me last night immediately after putting on a new Sigma 18-35mm Art lens and now I cannot even update the camera firmware by plugging it in because it is stuck in video and apparently firmware ca...
This just happened to me out of the blue (camera is about a year old) when I put a new Sigma 18-35mm lens on it. Maybe a coincidence it happened at the same time or maybe different lenses can mess with the firmware?
