Cat 5 surge protection

Does anyone know of a surge protector for cat 5.

We have a 100 mbt ethernet line into a server. about once a week the system reboots and we have to reconfigure the connection.

We tried OS reinstall twice, 2 completely new (custom built) systems.

Three different power supply's. 2 new UPS. tried a ac inverter on a dc power supply

.. the system still seems to be getting hit from a surge.

The Only thing I can think of now is the ethernet feed.

Any suggestions

 

 

 

 

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