Chromecast always Disconnecting

Hi,

When playing Deezer via chromecast from my ipad or iPhone, it stops and disconnects all the time. (Seems to do so more if i shut the screen of switch apps.) 
Doesn’t do so when i play from my imac via a browser. 

Very frustrating. 
I’ve got the most recent versions of the app. 
Any ideas? 

Thanks.