New router showed up yesterday, got it all set up, turned on 2 of the Formuler, immediately had a pop up for an update, did the update, and everything is working again, so not sure if it was the update or the router that fixed, but wired LAN works again. On a side note, with 10MBPS ADSL, there was a fair bit of buffering on Kodi, which I took to be simply the cost of using it on slower internet, but the new router, a Linksys EA9500 tri-band router, has solved that issue as well. With 23 devices connected to the router, and Formuler set on the router to take priority, there was no buffering at all. It simply ran smoothly for the first time ever at this location.