We haven't seen this issue. I'd hate to go wireless on our jobs because the Eero's are separated and performance would tank. But, we only have a few Eero installations.

Are there any Sonos units on the network? Diagnosing network issues can get tricky if there are any wired Sonos units. Sonos units will share their own mesh connectivity with anything wired to a Sonos player -- including the switch that would normally carry traffic to that player. We've had situations where a network cable was damaged and the network did not completely go down because a player filled-in for the missing cable, but at a much slower speed. Wired Sonos units require managed switches to use STP, not RSTP, if multiple Sonos units are wired.