I literally have had TWO issues with the 10 in over 20 hours of recording. One I can't explain - there were 2 missing files where the Hero 9 showed the 10 in frame and it looked like it was recording, but the numerically subsequent files were from another day - that's a weird one. The second was using The Remote and hitting stop/start/stop/start/stop too quickly. The 10 got confused and said NAH and just stopped recording. Not a big deal.
Every other recording has worked fantastically.
I'm waiting patiently for the new firmware - expected in November.
-John