Keynote presentation screen goes blank on Panasonic projector after 5 seconds

I am using Keynote presentation software with a shared screen to a Panasonic projector. When I start the presentation, it will display correctly on the projector for about 5 seconds and then the screen goes blank.

I have used the same model projectors several times with no problems in different training rooms for this company; it's just this one that is not working correctly. We connected a Windows PC, and it worked successfully.

I am connecting HDMI through the building cabling system that controls projector access.

Any suggestions to solve this would be a great help.

[Re-Titled by Moderator]