This is rather old review but i add this here anyways if there is any interest to older C100+ 2K version owners. There is 4K firmware update on sjcam china site, i don't know is it only a fancy trick to make it as 4K but see it yourself does it get any better with 4K setting. Site is in chinese...
I don't know is this valid or not but i tell it anyways because it fooled me. I have had one 70mai 1S D6 for long time and no problem at all, then i bought another as rear cam but i noticed also that new camera keep shutting down for some reason. It took me a while to notice that cam worked 20...
Due to this "memory card slow" situation i tried 128 gb card and after one round it seems to work ok, more info will come later. I tried same card to my mobius and it did work just fine but after detailed checking i noticed it missed clips here and there randomly, it's very difficult to notice...