I have no failed devices, but I did take two switches offline to install a doorbell transformer. Circuit is off try to run goodnight and my house is still lit up like a Christmas tree.
Everything works in the app but not the routines. But when I power the circuit back up routines work.
For a SmartThing how is this smart? Can’t even handle one device failure. I could see if some failed to execute because of the mesh, but mine is large and everything except the things on the powerless circuit still work just fine.