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RV320/325 Port failure cause

We have had three (3) different routers since 10 September and each time the ports appear to fail on either the LAN side or the WAN side. Here is the scenario: we were losing Internet connectivity on one LAN port intermittently for some time. We quickly changed to another backup router with the same configuration. It quickly did the exact same thing. Now, thinking we had an ISP issue, we had them check their line, make several corrections and we changed to a Cisco RV320 router. Last night the Cisco RV320 appeared to fail in the same way, except that it did not come back even though the lights were still operating. We could not ping the LAN port that connects to the main Switch. We only have two (2) switches in the building and this has just started happening. Any ideas on what we should try? We've isolated the network into segments, changed all CAT6 cabling and all power supplies, but this "event" is still haunting us. We did call for Cisco support, but no Partner ever called us back. Any help is appreciated.


Setup: One WAN port in use; two LAN ports ( and with inter VLAN enabled).

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