It had only been five days, but I already had a problem with the HomePod not responding. I wanted to listen to some music in the bedroom yesterday, while I was reading, and I started playing something on my iPhone, then went to stream it to the HomePod. It was playing, but no music was coming out of the device. I tried adjusting the volume by tapping the + on the top; no change.
The Home app, it showed that it was not responding.
After a bunch of attempts to fix it – restarting my iPhone, unplugging and replugging the HomePod – it still didn’t work. So I had to reset the device.
To do this, go to the Home app and find the tile for the HomePod. Press and hold its icon, then tap Details. You’ll see this:
Scroll down to the bottom and you’ll see Remove Accessory.
Tap Remove Accessory, and the HomePod’s settings will be deleted.
Unplug the HomePod, then plug it in again. Wait a minute for it to start up. Back on the main screen of the Home app, tap the + icon, and hold your iOS device near the HomePod to initiate the setup procedure again. After that, it should work (at least until the next time).