A few times now while shooting macro with flash the camera does some strange things - doesn't see the flash and accommodate on lcd or vf - the screen is dark and grainy and pumps the iso up. then sometimes when i shoot there is a black horizontal section over the top 1/3 of the shot consistently - its not a shutter synch issue, 1/160 1/200 speeds with a godox V860iii flash - and then also i have to fight with it to focus properly. Turning flash and/or camera on and off does not fix it, removing flash and reinstalling doesn't fix it - BUT when i remove the battery (one that came with camera) and put it back in the issue goes away. Also own an R8 and never have this issue.