Fuzzy video hero 4

[Rustydiver]

Normally when I';ve had my go pro on my hex its all been fine.
Yesterday i tried out my aeroxcraft gimbal for the first time that worked fantastic really steady, had a usb composite plugged in and the video playback on my mac seemed slightly fuzzy?
Could i be getting any electro magnetic interference?
The other thing i did use different was a go pro glass lens protector but when it was on taking photo mode they came out fine.
Photos and video mode seemed slightly fuzzed.

[Friskle]

If its fuzzy, it could be a very fine vibration, i had similar very slight fuzzyness to the video, which i never had before, when i inspected more closely, i had a hairline crack in one of the rail mounts.