I have a Samsung HW-MS550 and HW-MS650 soundbar and both soundbars have a serious volume control problem when using Spotify Connect.
When I try to change the volume from inside the Spotify app, the soundbars increase the volume with increments of 7 steps. This is way to course and results in either too low volume or way to loud volume. The volume increment should obviously be 1 step at the time.
The problem is also described in the following (locked?) topics:
But also on the Samsung forums:
Is there any chance that this problem will be fixed any time soon? The issue exists for 1.5 years by now.