I noticed several different people reporting issues with sensors being “stuck” over the last week or so. That is the sensor appears to say that it is always in motion, or always open, or something like that but the person can see it’s not being triggered. And it may be several devices all failing at once.
Physically, it’s very unlikely for this to happen. it would more likely be a failure of the status reporting mechanism, in this case the smart things cloud or the smart things mobile app. So that status was not being properly updated.
It occurred to me that this might be related to the new rate limitations that smartthings introduced in the last week. These are designed to limit any individual smartapp from firing more than 250 times per minute.
If you are issuing polling or refresh requests for a whole bunch of devices with a very quick interval, you might hit this limit.
It’s not 100% clear yet what behavior you would see if you did hit the limit, but it’s not unreasonable to guess that it might be something like a sensor status not getting updated.
So if you do have “stuck” sensors the first thing I would do is look at the activity logs and see how much activity there is, and how likely it is that it’s coming from the same smartapp.
More information on the new rate limits here: