Help me figure out this noise please!!!!

[crfnick56]

OK, I'm running the Orion Experience2 motor and ESC, both sensor-less, and I'm having a an issue with an intermittent noise/loss of power. It will only do it every once in a great while and its totally random. I can run 3-4 packs through the truck and it wont do it once or it will do it 5 or 6 times on the same pack....totally random. It will just almost like seize up and make a high pitch swueal, almost like the sound the slipper makes on takeoff but louder, and it will continue to make the noise untill you let off the trigger (which is always immediately) then it will run just fine until the next time it randomly does it. There is nothing binding in my drivetrain, I've checked that numerous times. Its definitely the motor making the sound. What could it be guys??

[bubu1.0]

Bearing going south or magnet spinning on the rotor shaft is my guess. Well you really cant check the magnet spinning but the bearings you can. Id say check the bearings see how they are first and go from there.

[crfnick56]

I'll check them today