Something is defiantly wrong. I just bought a 4k player last night and the 4k version of the Batman Trilogy to see if maybe the fact I was just running the PS4 pro was the problem.
Turned out it wasnt. 4x through the movie my projector / receiver lost video signal. Audio stayed running, just the video cut off for no apparent reason and I got a message on screen saying "no signal found". I had to unplug an reconnect the HDMI cables, then turn off and on the receiver for it to start working again. I bought the cables from Monoprice and got the "Active HDMI" cables that everyone recommended, even bought the expensive fiber cable for the 40 foot projector run I may need in the future, but right now have the receiver so close I was running a 10 ft cord to it. Signal still dropped out.
Even when it was working, I was not impressed in the least. And I mean that sincerely. There was absolutely no visual difference in running a $1800 4k projector , $200 4k player, and a $800 receiver than I had running a $600 1080p projector, a ps4 pro, and a $400 Yamaha vx-867 receiver.
I kept watching, hoping I could find a way to justify this massive expenditure ( for me ) on a side grade at best. I felt like the emperor with no clothes on. Had wife come in to see if she noticed anything....newp. 4k Batman looked identical to the Blu-ray versions I already had , minus the losing signal part. So the Blu-Ray version with an inferior projector actually out performs the much more expensive 4k projector and content.
Im willing to accept that something may not be right, but this projector / receiver combo is just not performing well at all.
Have tried adjusting the EQ of the HDMI port to a higher number, its in the manual... have a read and learn what it does.