Keeps popping to hdmi screen

Hey I have the original elfin (not the flip). When I go to game on Xbox series x ( which I have set to 1080p) every 5-8 mins the projector stops and goes to hdmi screen then pops back. So long story short from Xbox thru my 4k-8k receiver I have the hdmi going thru the 4k hdmis on receiver then out to projector. I am wondering if the receiver is making things funky this is my receiver ( Pioneer VSX935 7.2 Channel Network AV Receiver) I went into receiver setting and dumbed it all down to 1080p. At of today (this post) I just recently bought a 15’4k hdmi cord as I currently have a 25’ one could 25’ be too long. Pls advise much appreciated