It’s just that the timing is weird. Some people started reporting problems about 19 days ago, including the following
But then on April 20, a lot of different people reported that devices which had previously worked suddenly stopped working on that day, specifically multi channel devices and two different kinds of thermostats. And those devices definitely were OK a week ago.
So maybe two different problems?
I’m tagging a couple of people here just in case they have anything to contribute, but it might not be in their area. @posborne @nastevens