OK. I tried again now with this approach.
First, card spanning off, sd card overclocking off, 1080p 60 fps preset, red, about 9 seconds, stopped automatically, no error message
Second, card spanning on, sd card overclocking off, 1080p 60 fps preset, red, about 5 seconds, stopped automatically, no error message
Third, card spanning on, sd card overclocking on 160 mhz (needs sd card reformat and camera restart), 1080p 60 fps preset, red, about 3 seconds, stopped automatically, error message window out.
Allocated 105 slots
Fail info: (16382 16382 6501 3693) (127 151 182)
Then rolling like
Overexposure fix
Black 5/5: stdev too large
Black 4/5: stdev too large
Black 3/5: stdev too large
just tested here, same thing, about 10 seconds recording then console shows up with this same messages (btw, preset 1080p 40fps does the same thing)
I guess its not the speed since even 3.5K at +130mb/s is continuous
perhaps exposure?
I've seen some post about the amount of details of the scene, blurry (and slight out of focus) scenes requires less mb/s
Also, if the problem is the write speed then reducing 8-10 bit should be enough, but isn't