Shield - High-Pitched Tone When Pausing

TV: Vizio E50-F2

Soundbar: Vizio M512A-H6

I have a 2017 Nvidia Shield connected to the HDMI eARC port in the soundbar, passed through to the TV into an HDMI ARC port.

Randomly when pausing media on Plex a high-pitched, very loud tone is played. This seems to happen every 5-6 pauses or so, and is only stopped by pressing the play/pause button again.

The problem only occurs with Plex, other apps work fine. The problem also goes away if I change to an optical connection, but I’d really like to keep the HDMI passthrough setup for Atmos.

I can’t seem to find a lot of information about this other than similar stories. I turned on the setting to “play a comfort noise over HDMI”, with no success. Anyone have a solution?

Connect the Shield to the HDMI IN port of the sound bar.

Connect the TV to the HDMI OUT (eARC) port of the sound bar.