worked always fine with Samsung HW-K950 from all devices (Android and W10) - recently it pauses after an unpredictable amount of time - seconds or minutes, can start again but pauses again after a short time later
He guys - I'm sorry. I was appearently wrong to blame spotify. It turned out, that I suffered from short and randomly occurring internet connection failures. I did not realize that at first hand, because there was no effect in normal internet surfing. But meanwhile I got problems with other streams (netflix, amazon, TuneIn, VoIP-telephony) too.