Both are connected trough the HDMI ARC cable. To control the volume i always only use the TV remote. The soundbar is the device that plays the sound.
I noticed, that thew volume is jumping around, when i change the volume. For example I raise the volume from 7 to 14, but when i go backwards, the volume goes 14, 13, 12, 13, 12, 11, 10...
It's not always. Or it happens, that the volume is at 7 and when I want to make it to 8, it jumps to 14 instead. Also muting the setup with the TV control and re-enabling it again, also shows strange behaviour. For example, when i raise the volume again, the soundbar shows a "-" sign instead a "+" in the screen.
It also happened with the previous TV-firmware. But when I bought the setup four months ago, it worked perfect. And it seems it only happen when the soundbar is active.