I think it's something with the Spotify service. There is a long history of problems between Spotify and Chromecast. It's not the individual CCA units; when multiple units are playing in sync, the dropouts happen on all of them at the same time. The firmware is up to date.wonder if there's different versions of them, mine have been flawless for a few years now with daily use (as other's have experienced, hence them going up in price when discontinued) - odd.