I’m having this same issue with a brand new NAD C 700 (BluOS 3.16.5). It is only connected to HDMI ARC and Spotify. When woken from sleep, the screen will say that content is playing, even though there is no sound (the needles move for HDMI ARC and Spotify album artwork shows). TV is a B8 LG TV and the NAD is connected to the HDMI ARC port with PCM and CEC is enabled. If I force a reboot, everything works. I just got the device so I don’t know if this is a version issue. This is pretty unacceptable for a brand new device. I’m still within the return window and strongly thinking about returning if not resolved. Happy to provide any logs or do any troubleshooting to resolve. I have also submitted a ticket via a Support Request as well but I haven't heard back from anyone.
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