Here’s the situation I have with one device (a lamp connected to a SmartThings outlet). Frequently, I will try to turn it on or off with Alexa and get “Sorry, the device Bob’s Lamp is not responding. Please check it’s network connection and power supply”. If I open up the SmartThings app and turn the lamp on or off, it works. And once I do that, I can immediately control it again with the Echo. I also have a GE appliance module and several GE wall switches, and I haven’t had any problems with them.
Anyone have any ideas?