IPhone App very often stopps in lockscreen

[Selina33]

Spotify stopps playing (pause) until the lockscreen is active. Sometimes it works for a while in lockscreen. But then it pauses immediate.
When I never use the lockscreen it works perfect. I am using an iPhone 6 with iOS 8.3. Airplay over Apple TV and Express. Restarting the iPhone doesn't help.
Any thoughts?

[Jordi · Accepted solution]

Hi there and welcome to the community,

Could you try doing a full reinstallation of the app, including removing your local cache/data files.

[Selina33]

It works now! Thank you very much for your help. Great.