So I am a first adopter of Apple’s Homepod. It worked well until I realized that it only plays music from a subscription to Apple Music (I don’t have). It will play as an Airplay speaker, so I can tell Siri (Hey Siri) to play music and She (I have mine as an Irish-female or Aussie-Female) will play my itunes on shuffle (as I have it set on my mac, with itunes open and songs set to shuffle).
After the latest iOS 12 update, I found the homepod to be unresponsive to commands. I have it located up on a beam, in my kitchen, to allow better sound dispersion. Well, it requires a ladder to access and to unplug power. I also discovered the unit was very warm. After powercycle (unplug, wait a bit, then replug to good power outlet), it came back to life and was useful. For another week or so.
Same thing again.
Troubleshooting it now a week later, after same issue, I did a manual reset (unplug, press down on the top of the speaker WHILE plugging into power, Siri will speak about reset, KEEP HOLDING DOWN ON TOP, lighting will change to RED and then three FAST beeps. Now let go. You will need to add it again to your iPhone HOME app (keep iphone close and it will pair and start setup).
Most annoying feature of setup: it advertises if you want 3 months of free Apple Music … not really free as you have to add credit card and it will continue to bill after the 3 month period.
If this happens again, I am taking into Apple store. I paid way too much for this…dumbspeaker.

UPDATE: It has been over 10 days since I reset the Homepod and so far it hasn’t locked up. Perhaps the reset helped? Time will tell. IMHO, its not worth $350…

UPDATE #2: It’s been several months and no issues. I believe it was resolved with applying the last update of iTunes (12.9.2.5) in that Airplay + iTunes library being open on my mac, would no longer hang. Apple tends not to disclose details of “security” patches or other dev-discovered patches.