Motor strange loud noise at certain rpm

I have made a 3d printed ebike using a 6374 motor and a vesc 6 and I have been using it for a couple of months but yesterday it started making a loud noise above 23mph. There is no loss in power at all but it is very loud and is still preset under no load. I have taken the motor apart and it is clean with no debris inside to cause this. There are no vibrations elsewere which could have caused this. The motor is not rubbing against aything on the mount either .Any ideas why this happeed? It sounds like it is being created through electrical noise but it is hard to say.

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