I have heard that might be the reason my camera works 1 out of 20 shutter attempts on still and no video action period. Currently using a SanDisk - Pixtor Advanced 64GB microSDXC Class 10 UHS-3 Memory Card. Have tried the SanDisk Pixtor 64GB Micro SDXC Class 10UHS 3 Card with the same success ratio which was the cure Yuneec suggested. Any other ideas as to why I would have this random action?