Weird sound at mid rpm

Hi guys,

Can anyone help me figure out what this sound is when I hit mid throttle on my board?

Looks like there is more resistance on that one motor, probably a broken magnet

Could also be a shot motor bearing or too tight bearings that are on each of the shaft sides, inside.

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Whats that set up?

Or lose winding… Best to open up the motor and have a look.

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Setup is 12s4p running 6374s?

Thought you were running gears until I enlarged the vid lol. Yeah only a look inside will find that issue but check your warranty status first.