Hi, and thanks for responding.
I've already completed all troubleshooting tips found everywhere: powercycling the device, returning to factory settings and re-adding it to the Home app.
My wifi-network was a bit spotty (google wifi 1st gen) and has since been replaced with the asus xt12 mesh set. The wifi-network has been rocksolid since with the other Nest Hub Max camera's being online 24/7. The routersoftware shows me the connection to the doorbell is rated 'great' (when it's online). The doorbell is located 3 or 4 meters away from the primary Mesh router.
I get the "The camera's been offline for 10 minutes" notification about a dozen times each day. When I go to check in the app the doorbell is either working fine (the notification doesn't go away once the doorbell is back online) or the doorbell really is offline: it's shows offline in both the Nest and Google Home app. Trying to reconnect in the app does nothing.
The router software also shows the Doorbell as offline, like it's powered down or something. I've physically checked the doorbell a few times when this happens and it actually looks like it's powered down: it's not responding to pressing the doorbell (e.g. no chime sounds, definitely no notifications).
It looks like a problem with the firmware. Maybe some overly aggressive sleep-mode or something?
I do have an active Nest Aware subscription.
When I scroll through the Doorbell time-line in the Nest app, the dark sections are either "No events detected" or "The doorbell was off or offline". When scrolling forward through time, it's almost always first "No events detected" and then goes to "The doorbell was off or offline". Sometimes after a minute, sometimes not for an hour.
It's a Nest Doorbell (1st gen, wired). Software 4110055. Worked fine for years, until somewhere last month.
