Problems using my S5 as a video camera on the bike

[SportsterDoc]

I am wondering if the phone was - by fluke - sensitive to spark ignition interference? This the first time using the phone while riding the CB? Maybe I misunderstood, but did the problem persist after you walked away from the CB?

Good thought, although popgun's concern about the serial data bus may be more likely since standard spark plugs are resistor (LMAR8A-9S 6817).

However, any arcing from a loose spark plug cap could be an issue. Does not explain why it only affects video.