Identical servers.. one buffers… one doesn’t…?

[andrewmcd7 5]

I have an Emby server and most 4k is buffering. But the exact same files on an identical server is totally fine. I have uploaded the logs of the problematic server. But just cannot find any smoke and gun as to what the issue is or what’s causing it. One specific movie he has used is the Kevin Hart special. 
 

any smart people in the house could help?

embyserver (12).txt