Problems using my S5 as a video camera on the bike

[DBM_imp]

I recently upgraded my cell phone from a Galaxy S5 to a Note 8. I have been using my old S5 as a music player and off line GPS with Google maps. It is working great. Yesterday on my ride l tried to use it as a video recorder as l rode my Black Beauty through some local twisties. I was having problems with some unknow electronic interfearence causing the video to pulsate with waves across the screen. I tried changing camera position, turning off other apps, unplugging the USB power, etc, but nothing worked to solve my issue. This phone has recorded countless hours of perfect video footage over the last few years in my hand. Anybody had this problem? I can post a link to the footage if needed. This was not just vibration, it was sometime else l have never seen. Looking for help to solve this issue. Thx