So I just put in a new FOCBOX and a new motor on my board and now I’m getting this strange sound from the motor. Although the sound still comes when I put the old one back in so I don’t think it’s that.
I can’t test my old FOCBOX as it blew up, the only other thing it could be is that during an earlier test the receiver for my Benchwheel remote blew up 
, so I had to switch to a crappy old winning remote, could that be the cause?
Video:
Sounds to me like something is arcing or a bad bearing. Hard to tell.
On 2 separate motors? One is known good, the other is brand new, they both spin freely by hand 
It’s just what it sounds like. Could be a bad wheel bearing, not a motor bearing.
Sounds like a bad detection
Rerun the detection with a higher duty cycle and amperage value.
Bingo! 
thanks, this was it, my battery was close to the cutoff voltage when doing the detection.