As someone else mentioned I think that you need to ensure that the sensor harness is fully seated into the ESC's connector.
In some ESCs if you do not plug the sensor in the ESC assumes you are using a brushed motor and will switch to brushed mode... which can cause excessive heating to a brushless motor.
If all the connections are fine (sensor harness plugged in properly, no shorts between the phase wires) there's a chance the motor winds could have a short in them somewhere... but it's just as likely that there is some sort of problem with the ESC.
Unless you have another motor or ESC to test in the system it can be difficult to determine which component is actually bad.
If you don't have access to extra equipment to do this testing with, you can always send the motor in to us for evaluation.
We will test it out and ensure that it is in working order.
If you go this route, please complete a warranty service form for the motor and be as detailed as possible about the problem you are experiencing.
The warranty service form can be found on our website in the customer service section.
Oh yeah... anytime you want a quick response, you might want to consider emailing us directly at email@example.com
or calling us at 949.833.8873. We check the forums regularly... but email and telephone are the preferred methods!