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Thanks, I've enabled that and I'll check it out. I also found this post from someone who was having a suspiciously similar issue with pfSense: https://forum.netgate.com/topic/165986/devd-ethernet-detached-event-for-wan.

The solution for their problem seemed to be to put a dumb unmanaged switch in between the router and the NIC, so I've done that and we'll see how it works out.

I'm running OPNsense 23.1.11 on a 1Gbps Frontier FIOS service in place of the ISP-provided router. It's running on a Zimaboard 432 (Intel N3450 quad core @ 1.1GHz, 4GB RAM, 32GB SSD, 2x Gigabit ethernet). Most of the time it's just fine, but around once a day, it drops the WAN connection (occasionally LAN instead, but mostly WAN) for a few seconds -- logs show the interface DOWN and then back UP normally around 3 seconds later. There is no correlation that I can determine with time of day or traffic activity. There is often a watchdog timer in the logs just before it drops, though.

Any ideas? Is my hardware simply underpowered? Are there places I should look for more debugging information? Config options I should test?