Format Your SD Card to fix reliability issues
Sometimes your device may stop recording or seem unstable.
Many times this is due to the units battery going flat half way through recording and leaving a corrupted file on the card.
Sometimes it is because your SD card was not formatted from the factory.
To resolve this you will need to remove the card and reformat it. You can find a great article here on how to do that on PC and Mac.
Formatting your SD cards will fix many problems not normally associated with the problems you may be experiencing.