Can you try to reinstall NDI tech tools from:
https://www.ndi.tv/form-mac-tools-ndi5

No budget? This is my machine:
https://www.razer.com/gaming-laptops/Ra ... 9CE53-R3U1

What happens if you render out a 10 second clip of static/noise in that resolution, and then add that clip into your comp (same resolution) and play it back, outputting to (3) NDI 4K outputs? That would be a good benchmark to see how well it will perform in the real world. Be sure to let it run for ...

Give me your panel pixel count (wXh) and how many panels (wxh) you are doing for all slices and I can build you up a pixel map.
What processors do you have? Novastar?

I've had comps crash before due to a video file being corrupted. So at that point you have to open all your files in Alley and find the culprit, then open your comp in Sublime and remove the line of code with that clips name and location and that usually fixes the issue. What you have going on is so...

It varies from show to show on screens connected and comp size.
When I load my comp, those are the stats I get. My comp typically lives at 4K.

Possible: Yes
FPS above 20 after running for an hour (thermal throttling): Probably No

So your output screen is almost 8K eh?
Do you have 8K content for this event?

Looks like this file is very corrupted. When I open one of my comps in Sublime I get a typical XML format. Your file is all 0's.
Do you have a backup?

Are those clips DXV3?
The more clips you load, the more thumbnails need to load as well. But it shouldn't be too much. I have over 1000 columns of video clips that load up (5 layers) and a TON of FX. I'm using 0% GPU and only 105MB of system memory. Are you on 7.6.1?

Yeah, I've done a few installs with IR sensors and pressure pads. I send data out via DMX and then map that to Arena.