Issues on FPV drone

Hey guys -

we tried to get some FPV shots today with the Spark and ran into a few issues. 

Camera is powered with a small lipo (6S).  One time the camera powered down when hitting record.  On every flight the camera self-cut before landing.  As there is no record indicator its impossible to tell when it cut (could have been right after take-off).  Very frustrating experience but was curious if anybody else had similar issues (e.g. is there an issue with the camera not being able to handle vibrations) or the other way around: has anybody successfully flown the Spark? 

Hey, are you sure the camera is getting enough voltage?

Sounds like it could be a power issue.