Server Version#:1.41.1.9057
Player Version#:1.103.1.238-223cbba6
I have had this problem for the last few months when I start a playback on my second screen (1920x1080) my main screen (2560x1440p) and my second screen blackouts for 2-3 seconds and comes to normal while my audio keeps playing. Everything runs and is stored on the same PC
The question was about the setting in the Plex app.
Settings - Plex for Windows - ‘Show Advanced’ - Player
The checkbox “Enable Refresh Rate Switching” must be clear in your use case.