Did you by change enable cast/Chromecast/Google Home devices? After I connected my Google Home and Chromecast devices, the frontend never showed up again after restart, and the logs were pretty uninformative. After one rebuild of the whole system, and having the same result, I started doing some more research, and stumbled upon some posts.
I followed the post found here, and after that and a restart of the whole server, I had my frontend show up again: