If the device is tilted more than 60 degrees (or 30 degrees from the ground) for more than 5 seconds, you will hear three(3) rapid beeps and the Visual Alert Light will flash Red-Orange-Green. This means the incident mode is activated. Fly12 will continue to record for 30 minutes before saving and powering off.
You can turn this off by connecting your device to CycliqPlus app. Go into the Settings>Config settings>Incident Mode. There, you can toggle to either turn the Incident mode on or off.
Alternatively, you may have a look at the Fly12 Hardware Manual. It runs through the manual settings which can still be accessed without the use of a smartphone.