I've got this build on two boxes. One of them is fine. The other box has a strange issues where most of the time I can't adjust volume from the box. The volume is showing as increasing/decreasing but the sound level on the tv is the same whether it's full or at the lowest setting. The only time there's a change is when I drop the volume to '0' and this effectively mutes the sound. Strangely every once in a while it works but can't work out a pattern. Anyone else come across this and know how to fix it? Gets annoying havin to keep getting the tv remote to adjust volume.