I personally haven't had the same situation, but I do know that there is a thermal cut out on all motors which will disable the motor if the copper windings get too hot. It is used to prevent a fire from occurring. When the copper windings cool down, the motor is operable again. This possibility may not be likely for these two cases since you said you just bought the motor. However if it is an older motor/service motor, it may be the case. But still it's rare. If it seems the only option is this, I'd call the manufacturer's service department to have it checked out.
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