Spotify won't connect over Wlan

[Fix3l]

Hi!

The Spotify App on my new iPhone 6 won't connect over Wlan. When i turn Wifi off everything is fine.

I never had problems with my old iPhone 4.

Is there a Solution?

Thx fix3l

[Fix3l]

My iPhone 6 is on IOS8.4 an Spotify 4.3.0 is installed.
On my iPhone 4 (IOS 7.1.2 and Spotify 4.3.0) everything is fine
I'm using Spotify as a Partner of the german Telekom who doesn't charge me for the traffic Spotify uses. Could this be the Problem?