I have an issue which I thought I had sorted out last night by reading a really helpful post on the community.
This morning a related issue but different outcome had presented itself.
Basically I was getting no sound through the soundbar so turned off the HDMI-CEC controller in settings on the FireTV Cube audio visual settings.
When I turned on the TV this morning I had sound through the surround speakers, no sound through the beam and sound through the TV speakers.
The only way to fix it was to unplug the HDMI lead from the FireTV Cube, turn the beam off and then back on and plug the cube HDMI back in.
After a couple of minutes the sound disappeared again so I turned the Beam off for 5 minutes and since I turned it back on there has been sound.
This has happened a number of times since I installed the Cube on Thursday but there must be a technical reason for this.
Can anyone offer any advice please.