ePMP 2000 AP , itis rebortting in default time

Hi 
Ihave ePMP 2000 AP , itis rebortting in default time

**(turn off and turn on by it self without delete anything)**

1- We tested cable from AP to Data port in power supply is (PASS).
2- We tested every cable is (PASS).
3- We tested power supply is (PASS).

Please see the explanation above and send me the solution ..

Thanks,