How can I fix Siri's inconsistent response on my HomePod?

Last week, I asked Siri to increase the base in a song playing on my HomePod and bam, done. Today? “Sorry, I can’t do that”. Ask again five minutes later? Response is, “What should I set it to?” When I first bought my HomePods, they’d reliably play my music. Now they “Can’t find that in my library” anymore—even songs purchased in both iTunes and Apple Music and even after I’ve made sure all the devices are on the same WiFi network, etc. Why is it so difficult to get these apps and devices to sync and stay synced? It’s really infuriating to spend thousands of dollars on products and not have them work whenever there is an update. How do I fix this stuff and make it stick?

[Re-Titled by Moderator]

Original Title: Moody Siri