I don’t know. Maybe. I have no idea if or why this would be related, but it is very coincidental… I noticed I was also getting error logs about my Alexa integration already being logged in. So I looked at my Integrations page and noticed it was there twice. I took out one instance of Alexa, and both errors went away. Like I said, probably just coincidental. Any chance you are having the same issue?
I’ve restored connection to some devices that were offline and the errors disappeared.
So in my case, it was probably caused by a Philips Hue Bridge being offline or a missing connection to a few Z-wave devices. I suspect the Philips Hue Bridge.