I had similar experience with the Ultra in a GoPro 3. I wasn’t even recording at 4K, but merely at highest quality 1080p. When I tested the card, it couldn’t do sustained 6 MB/s write. GoPro stopped recommending the Ultra shortly after in response to complaints from many users. Don’t know if these are better, but I’m…
I had similar experience with the Ultra in a GoPro 3. I wasn’t even recording at 4K, but merely at highest quality…