Installed IOS 15 yesterday and this morning as I was listening to music through my Airpods I noticed that every few minutes the songs would slow down, and occasionally speed up. The slowdowns generally lasted no more than 2-3 seconds but boy was that annoying. This happened with both my Airpods V2 and my Airpods Pro, both running the latest firmware. Never had an issue like this before. This doesn't seem to happen for me with Apple Music, just Spotify.