One hub has lost cloud connection

I have 2 C7s, both running 2.3.9.158. The only real difference in the hubs as far as I know is that one is enrolled in the Beta program, while the second is not. Both hubs are registered at my.hubitat, and have always been visible in the cloud. As of about 28 hours ago, the second hub is reporting no cloud connection. Nothing has changed that I know of. At "Find My Hub", neither hub is located unless I use IP address or MAC to locate it. When I check registered hubs, I see both, except the second is listed not active, and the last check-in was about 28 hours earlier, which is how I know of the disconnect.
I tried a reboot, but it had no effect. I don't remember when the firmware was updated, but it was recently, as soon as the new version became available for general release. The first hub, in Beta program, was updated to that version earlier, when it was still in Beta, but that one is working.
I can access both hubs normally via browser, etc, and everything else appears to work as normal.
What could be the issue? As mentioned above, I've changed nothing on either hub, and, at any rate, I don't see any means to affect the cloud connection either locally or at my.hubitat.
=mike

Added note: Just upgraded the first hub to Beta release 2.3.9.159, and now it, too, reposts "cloud connection unavailable". It still indicates "active" at my.hubitat.
At this rate, I'm concerned that any further firmware "improvements" may render both devices completely non-functional!

Have you tried a full shut down, down power and then restart?

Has no effect.

I'm less concerned that there is now no cloud connection at either hub than that the alert is persistent and cannot be dismissed. It's rather annoying that now two units always indicate an alert, which may be followed by other alerts, but there's no way to acknowledge and cancel the alert, as the problem has no solution.

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