I have the same thing. I've noticed that the driver now updates the operating status state variable. I'm guessing that there's been some changes to the integration that are not playing nice with the typical Ecobee outage patterns. I don't know what's going on with Ecobee, but their reliability have been in the gutter for a month of more. I'm yanking them out as soon as I can afford replacements.
You probably won't notice the impact. I believe it has to do with updating the state, which prior to the latest point release was not being updated at all. It now get's updated with heating and idle states for example. With that update, this error began. I believe it's polling the API and only fails on occasion, which is what we're seeing. You might see that when the exception occurs the state of the HVAC isn't getting updated.
All speculation. I use the state to open and close vents, so I noticed when it would not update. Unless Ecobee improves their API experience, I don't see this problem going away. Tight integration with Ecobee isn't reliable.