I'm having a similar issue. Yesterday I was having problems with my IoX in general, it wouldn't control devices/scenes based on expected state changes or inputs, the mobile app failed to synchronize with error messages, and the programs tab in the iox interface would not load. I ended up rebooting the eisy which took forever to finish starting up. Today I noticed my Sensibo was not behaving as expected. In the IoX interface, I could not turn it on/off. No apparent issues in Polyglot so I uninstalled/reinstalled the node server, reconfigured the api key, and no nodes.