Samsung smart TV Player reverts to HDMI or PC

My office has samsung displays in common areas and we are trying to use the "Player" feature to display slides and graphics relevant to our staff members. With some displays, this works easily - navigate to home>player>send/play etc. and it's good to go.

With other displays - same type of display - I can navigate to home>player but then after a few seconds (usually before I can get send/play etc highlighted) the display reverts back to HDMI or PC and I can't figure out why. It must be a setting, but I'm not sure where to start to to figure out which setting and change it.

Any ideas?

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