You need to do a process of elimination, first question if you have any scenes set to turn this light on or off from another device, disable and see if issue goes away. If you can confirm that it still behaves this way with no other software using the device, and just a simple install of the device, there is a small chance the device itself is faulty. Also take a look at the logs when it happens to work out if it is sporadic or not for a reason that it came on or went off. Also make sure your WIFI signal is good, had that issue previously. Hope this helps, please let me know either way.

You can program any other button, even light switch to turn device on or off. Or use your phone. It's because its installed in the roof

Watch the video slowly as it must work, maybe try find another video to see how it works. I can do another video for you tomorrow, because it definitely works to default it.