same problem since approx. 12/2019. I use Spotify on iPad Pro, latest version & software and playback via Chromecast on Google Home (latest version) and other connected speaker in my home network. Playback stops every 2-3 songs automatically and disconnects from chromecast. I checked nearly everything. It is not WLAN, I reinstalled Spotify after clearing cache, I logged out on all devices via master account...no change. It is for sure a Spotify problem on iOS with chromecast. It worked perfect for 3 years! This is really making me crazy since 3 month and if you do not fix it I will switch to Apple Music or Deezer. It is impossible to use Spotify in my hone network.....Thanks
I have no help to offer. Just adding that I too have this problem. From four different iPhones to two different Chromecast all the same. It plays for 30s to 15min and then stops. On average it plays about 2minutes but it seems rather random. I have tried a bunch of other apps, for example Netflix and they all work fine.