Playback, pause and stop on Plex (aTV) has a delay with sound. Cannot find out what it is

Plex Media Server NAS & Devices
1

Plex worked fine in this configuration. I don’t know what exactly happened, I think I went through the settings. I did get a new router/modem. There was an update of tvOS (both Apple TV and HomePods). I do have my HomePods as default audio out. But on other video apps there isn’t a delay. Both Apple TV and NAS (DS918+) are connected via ethernet.
Yesterday I also received a network (or transcoding) error. I didn’t notice it enough to state what it says or to reproduce.

Can anyone point me in a direction to look for a solution?

Server Version#: 1.21.0.3711
Player Version#: 7.11 (22422)

2

Did you do the wireless audio sync? If you use content/frame rate matching you have to do a separate calibration for each output. (24/60hz, SDR/HDR)

3

No, because it is only happening with Plex. My TV app or aTV+ doesn’t have this problem.

4

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