Had two devices set up with on at sunset , off at sunrise. Said devices worked with no problem for a year or so. After a power outage one device did not reconnect to network and had to be reset, no problem not hard to do. Since that time the device that had to be reconnected does not and will not follow scene on and off any longer.
Have tried removing and reinstalling device, starting a second set of scenes soley for this device. Deleting all scenes and starting over with a configuration that worked before. Still not working on the one device although the device does respond to on/off commands from the app and the second device works fine.