How do I resolve 'Unable to Process This Request' error while streaming from Computer Library to Apple TV 4K?

I am constantly getting the error 'Unable to Process This Request' while streaming from my downloaded library of videos to Apple TV 4K units. This began roughly 3-4 weeks ago. No difference between TV or Movies. iTunes, and Apple TV 4Ks are both updated last week to newest version. This is consistant with all 3 Apple TV 4Ks in the house. Is this an Apple thing or is it a Router thing? And what is a workaround.