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The video has no issue recording, only the Slow-motion camera, (it’s at 1080p 240fps.)



Kallum.
 
Try getting your hands on a vintage filament style ( sometimes referred to as an Edison bulb) light bulb. Use that as your light source and I would take bets that your problem goes away.
Or even a candle?!

You could then swap between, led light and candle light and see the effect come and go.
 
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