Installed a C320 with a Samsung 64Gb SD, formatted in the camera and all recording ok. 
 

This morning went to check and said problem with the SD, couldn't see any recordings, asking me to format etc. 

Tried to format, wouldn't kept failing. Decided to try and reboot via the app. It rebooted fine, and now the SD is ok and I can see the recordings from days ago, although it stopped recording last night until now - not good. 
 

So I've just installed this as a security device but it's failed already within 3 days. Luckily I checked today to see otherwise would have just stayed like this. No email/notification via app to tell me there was a problem either. 
 

So there obviously wasn't anything wrong with the SD, even though it told me and there was with camera. It's brand new, all updated firmware. 
 

Is this normal? Anything I can do, as I don't want it to be unreliable when it's specifically for security. I record 24/7 on it. 
 

Thanks