Anyone having issues with video recording? - 1080p60fps Stuttering

I seem to be having issues with video recording and stutter. The settings are 1080p 60fps, being recorded to a SanDisk Extreme Plus 64GB. It's almost as if the phone can't keep up and it makes the end shot look terrible. Not to mention my auto focus is constantly readjusting and out of focus. Anyone else having similar issues and/or know a fix? Here's a quick example (warning a little loud).

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