For reasons I can't explain, mine suddenly started working again about
three hours after reporting the problem through the Google Home app.
Probably a coincidence but i now have a "great connection" on the second
point and much more responsive Wi-Fi ...
Same problem here. 2 routers. Second one less than 25 ft away. A couple
of drywall walls between them. Great connection for months. Now weak. No
changes to network.