Carat1 wrote

Please see Edison's reply in this post: http://forum.tp-link.com/showthread.php?100660-CPE210-reset-itself

1. Your CPE was not grounded well.
In some area, because of the whether , the geographic environment or the electromagnetic interference, CPE may suffer some current shock.
This current shock would trigger the hardware reset of the CPE. Even more, cause damage to the CPE.
So please make sure that your CPE have been grounded well.

2. When you power the CPE with non provided PoE injector, because other injector's current parameter doesn't meet our CPE,
it will also cause auto reset. So it is recommended to use the provided PoE injector.

3.If the distance between injector and CPE is too long, the CPE will work abnormally.
Maybe reset itself, because the current is unstable when the ethernet cable is too long.

4.If the quality of your Ethernet cable is bad, and influence the current transmission, it will also cause reset problem