I agree with all the comments about the quality of recent Apple software releases, but getting back to this issue...since updating to iOS 18.1, I no longer have any static/popping issues since HomeOS 18.1 ; However, playback on iOS 18.2 across paired stereo HomePods (all types: Gen1, Gen 2 and Minis) is so bad that I can no longer use AirPlay.
The problem is that the music stutters and then plays out of sync which makes it impossible to enjoy playback.
I checked my network and have a single 5Ghz SSID to which all the HomePods are connected. Whenever I play from your iPhone, the problems start within 10 minutes. PREVIOUS to iOS 18, I could play across all devices in multiple rooms on multiple floors. My up/down rate is about 300-600 (fiber in France!) so there should be no latency issues. All 5 access points are hard-wired by home runs to the router.
The problem does NOT SEEM to occur when playing from my MacBooks running Sequoia 15.2.