"Cloud Connection is Unavailable"

Just like other users I have a C7 which was running 2.3.9.184 perfectly. Very stable. After the update to 2.3.9.193 the "Cloud Connection is Unavailable" message appeared. Having followed all of the germane threads and tried all of the suggested remedies the error message persists and has NEVER cleared. Reverting to 2.3.9.184 did nothing to resolve the problem. Without the "Cloud" connection an update to 2.3.9.196 seems not possible. Now Hubitat shows no "Registered Hubs" associated with my email, is unable to "Find" hubs even when using the Advanced search features, and will not communicate with whatever it needs to talk to for updates and registration. It was working perfectly, including updates. How do I make this thing talk to Hubitat again, get registered, and receive updates? I am a simple retail user, not a compsci guru so put it in plain English please.

Reboot the hub - this will normally reconnect the hub to the cloud for a brief period - immediately update the hub to the latest production release (I believe it may be 2.3.9.201).

I have the same problem. My C7 shows "Cloud Connection Unavailable" while my C8 is now OK, after some fiddling in Network Setup. No amount of fiddling, restarting etc. has brought the C7 back. Both are on 2.3.9.201.