I have not had any new issues.

The last couple of jobs I had issues with were using the original Eero Pro as the router. Mind you these were medium size homes. I swapped the primary Eero for the new, larger, wifi6 Eero Pro units and the issues have seem to be resolved.

I spoke with Eero tech support a few weeks ago, and the fellow I talked to claimed that when hardwiring Eero units, the network switch was normally the issue. He sent me a list of unicorn switches that have no "smart" features built in. It was a little ridiculous.