I have the SmartThings Hub v2, and currently have installed about 3 dozen Fibaro light switches (Z-wave) and a handful of other devices. They have been stable for a few months now (though I still have another 70+ Fibaro light switches left to install). I use the Classic SmartThings app (though I have the new App as well - but it lacks a great deal of functionality).
When I got home tonight, I noticed something very strange. If I turned on/off a Fibaro via a physical switch, the lights turned on, and the app recognized the state change. But, if I tried to remotely turn on/off the Fibaro (via the Classic or New App), the screen flashed for a split second and the state did not change (and the lights themselves did not change state).
And this happened for all 3 dozen Fibaro switches. If I tried to use Alexa to remotely control the Fibaros, nothing happened (though Alexa sounded the tone that it uses when a command works).
Yet, I was able to turn on one of the Fibaros as recently as this morning via Alexa. Just cant figure out what could have happened sometime today.
I tried rebooting the Hub, as well as rebooting the App (and my iPhone), but nothing helped.
It sounds to me like there may be a problem with the SmartThings CLOUD, which somehow just started today. It is odd that the App detects a state change from the Fibaro switches, but I cannot use the App (or Alexa) to issue a command and cause a state change. Not sure when the Hub actually uses the cloud (other than for something like Alexa).
What is even stranger is that my few other devices (Kasa WiFi switches, an Aeotec Z-wave dimmer plug (similar to a Wemo) and the Samsung Button) all seem to work fine from the App. Only the Fibaro switches present this problem - but it doesnt seem likely that 3 dozen switches started to partially malfunction sometime today.
I just cant figure out what could be affecting only my 3 dozen Fibaro switches, and only preventing them from receiving a remote command (since they work fine from a physical switch, and even report their state correctly to the Hub and the App).
I will try Samsung tech support in the morning, but they have not been of much help in the past (and never respond after elevating an issue to a higher tier of tech support). Will also try Fibaro to see if they have any other thoughts.
Appreciate any thoughts from the community.