Good morning..
No pcaps, and logs are probably still on the system.
We've had to replace the system. We've changed network card after network card, and at best this has to be static electricity damage to the motherboard. On changing network cards, no matter how many times we applied the configuration, no dice. On reboot, it's back to square one. Put back in old network cards, no problem except now even though with hardware offloading off, by next day the network is crawling to a stop, so enough milling around, We're beating a dead horse at this point. Will be ordering Netgate replacement, but in meantime, we're running CE on VM. So, I'm not sure what kind of spike or transient got through, but now it appears two switches at other locations are affected as well.