Are you going to do a more thorough autopsy of it, to find out what really went wrong? I don't see you as the type to be content with "some unknown thing went wrong with it," without wanting to know more.
I successfully fixed a few Smarthome Togglelinc switches - an internal capacitor would fail, and the whole switch would just die. Good thing it was a through-hole mount part, in an easy-to-access location on the board. I fixed at least two s far, and I have a third that might be on it's way out (it randomly dies - but I've so far been able to rescue it by just pulling the air-gap switch, and pushing it back in. I don't even need to do a true reset - and re-set the address.
The next time it happens, I'll probably pull it, and swap it for one of the repaired units I have (that are in my "spares" box now). Then I can fix this one when I get a chance.