I doubt if it had anything to do with ADT, because a lot of people are reporting problems from last weekend regardless of the devices involved. There were actually three separate sets of problems.
If you are getting a message from Amazon that smartthings is not responding, see the following thread. This is a known problem and they are supposed to be working on it.
Two. If you use webcore as any part of the set up, it broke because of daylight savings time. Thereās a fix for that one. See the following.
If this is just a general, āthings that were working fine for months have now stopped working,ā see the following thread. Itās not clear whether all the problems reported there are all related to each other, but they all happened around the same time.
There is also a separate Alexa problem which has to do with the new Alexa feature for their routines, but that wouldnāt be something which had been working for months and then stopped.