Just to report there was definitely an update to CoreAudio in the third OS X 10.11.4 beta yesterday. The “crackle” and re-sync is definitely not a service issue (Spotify, IPTV – flash) as I assumed. I have experienced it several times today. I am not expecting fixes/updates regarding this. Just for heads up.
On the other note I hope you are aware of Sparkle Updater vulnerability. Just in case you are not using latest framework. https://vulnsec.com/2016/osx-apps-vulnerabilities/