Just looked at my HE and it appears to have ceased many functions since midnight.
Log shows countless errors on many devices and looks serious to me.
Have not done any firmware updates in months. Done a reboot and waiting to see what happens now.
Appears to have lost comms with the internet. I have several http posts sending data to a web-server which have also failed. Have also rebooted my router.
Using the Diagnostic Menu, you should be able to reboot to Safe Mode. Logs would then show you if this continues. It works by shutting the Apps. You can reboot and use the disable column in Apps to do much the same thing. Once you've found, in a 'big hammer way' what's causing it, you can start to re-enable slowly and narrow down to the fault.
There's a grey X that, when clicked, turns red and...
... adds a Disable column:
You may find that a Restore to a days old backup might provide a clue or two.
My guess is some of those devices got into a bad state, started hammering requests, and the hub clamped them down because of high resource utilization (the latter part is not a guess; that's what the logs are telling you).
I would disable the devices, reboot the hub, then re-enable them one by one making sure they come up properly.
My guess too. I have this happen with some MagicHome RGB controllers. Once the driver stops talking to the device, the driver will continuously try to reconnect eventually leading to the same errors. By the time I find it, I have to go through the process I mentioned above to get the hub to relax.
The MagicHome drivers must have especially bad error handling. I had those same drivers killing someone elses hub I was working on. Ended up just removing them as he was not using the devices anymore. Hence the errors, devices were offline but driver just kept trying over and over again forever.