AirPlay drops connection shortly after listening a music album

Hello

Since iOS 8 I'm experiencing an annoying problem.

Shorty after listening a music album, it could on Spotify or Music app or other apps, the connection to AirPlay drops. When I want to listen to more music, the iOS device plays on the built-in speakers. So I select AirPlay again, choose the desired music device, and AirPlay works again until the album is finished, then the issue occurs again and again.

It worked fine with iOS 7 and I haven't changed anything in the configuration: same devices, same wifi, same router, same stuff.

Any ideas?

Thanks!