Your comments

Yes I'm connected to the WIFI before I start the app.

it happened with:
"SomehowJazz (" - a 320KBps MP3 Stream
"Radio Paradise - Naim Exclusive" - a 320kbps AAC Stream
"Skywalker FM" - 320kbps MP3 Stream

Those are very high bit rate streams, but still, this should not be a problem, if I can watch video on the same device.
Buffering was quite slow - sometimes took 20 sec and than ran out after 15-20 sec of playing.

I experienced this behavior in the hotel where I stay during working days and also at home. At home I have "perfect connection" - my phone is 1m away from the wifi router.

It would be interesting to know if other users have problems with high kbps streams on there devices.