Similar issues since approx. July 2024. After a software update. One of my Stereo paired 1st Gen HomePods. Extreme crackle, static...and dies...sometimes boots itself back up after a few minutes. I can re-connect via Airplay....and the scenario repeats (my other 4 HomePods, Mini's ...all fine). Completed a lot of trouble shooting, WIFI, restores, pairing, unpairing. Also logged a case with Apple who appeared interested, but after a few days trouble shooting, done by myself, and getting back to Apple, support has dropped off. From what I can read, apple are aware, and this is a known issue for many users across the globe. My visit to the Apple Store, gave the distinct impression, they know, and are not keen at all to take further. I was more or less told, there is nothing apple can do, aside from offer to sell me a new HomePod (a Gen2) that does not even pair with my other unaffected a Gen 1....at FULL price.
All of trouble shooting, leads me to believe AirPlay has some major issues, and the frequencies seem to also be a problem. I will not swear on here, but given the huge amounts I have spent on Apple, for the last 2 years, this is beyond poor and dissapointing, as Apple truly do now seem to just not care anymore. They never used to be like this.. A fix would usually have been rolled out by now. Or even an option to restore to the previous software/firmare...but NO.
Let us know if you get any further with yours. Thanks.