Somehow I managed to turn on a setting that is making the camera take still shots (frame by frame) while taking videos. This is a feature that's available on the Hero4 but not on Hero 3. I'm not sure how to turn this feature off.
Here's the same feature on a Hero 4...
I'm looking to run hardwired USB power up to the mirror area - not a cable hanging, but an actual port. Has anyone done it? I'm having trouble finding a spot up there or a part to do it with. I'm using it for running a hardwired Dashcam AND GoPro.