net3 acn gateway cannot ping until reboot gateway

We have a network working fine for several years.  We had a recent power outage.  After the power outage the gateways will intermittently go offline and we will not be able to ping them until we reboot the gateway.  Nothing changed on the networking side and we see no drops or errors.  Any idea what would be the cause?  Also, the gateways will appear to be frozen when trying to move through the lcd screen.

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