DRV8350R: Motor Heat

hello ,  all :

we use DRV8350R to develop a BLDC Driver .The PCB have 3 DRV to drive 3 BLDC .

The motor we used have hall sensort , then depond on the hall sensor , we let DRV output different phase for BLDC to let it run .

When we test , one motor got heat . When we find the motor heat , we power off then power on for the PCB and then the motor didn't heat anymore .

Also when we find the motor heat , we didn't hear any noise of the motor .

Motor heat didn't happen many times .In fact , we power on for 20 PCBs , and run for seral days , it only happen 2 times .

Do you have any suggestions for the motor heat ? Or what need be checked to find the real reason of motor heat ?

Thanks

lining