My HomePod volume lights are blinking

Unplug it for over 24 hours then try a hard reset

Press the top of HomePod to reset it

1. Unplug HomePod or unplug the power adapter for HomePod mini, wait 10 seconds, then plug it back in.
2. Wait 10 seconds, then touch your finger to the top of HomePod and hold it there.
3. The white spinning light will turn red. Keep your finger down. 
4. Siri will say that your HomePod is about to reset. When you hear three beeps, you can lift your finger.

If you still see HomePod in the Home app after you reset it, then you'll need to manually remove it from the Home app.

Reset HomePod - Apple Support (CA)

Were you able to reset your HomePod?

I took mine to the Apple Store and he told me it is most likely a firmware issue that cannot be fixed!

And the only thing they could do is sell me another HomePod for $279 ! I have had my HomePod for 2 1/2 years and the tech told me they are usually good for about 3 years! I have a Pair and now only one is working and the other is broke, he says unfixable. If anyone knows a trick to fix this issue on HomePod let me know.

The only trick is the one I posted above. It has worked for a few people.