So that was unexpected, as my camera has never suffered from dropped frames before.
One of the shots had multiple missing frames, which open as solid red frames.
The camera is Ursa Mini 4,6K, with a Lexar X3600 256GB card, on full RAW, on full 4608X2592 resolution at 60 FPS.
Of course the "stop rec if card drops frame" option was OFF, but that does not fix the problem.
Very rarely I do shoot 60fps 4.6K RAW, but is it something normal to be aware of?
Here is a part from the shot:
http://www.newactorsstudio.com/storage/ ... FRAMES.rar