Unable to play any files without transcoding now!

I have been user for years always worked fine. Have unraid server with Plex docker server pushing to Amazon fire tv.
I keep getting not enough bandwidth for direct play. I am running on a gigabit lan with cat 6 wire. I have researched and am unable to determine if transcoding is referring to network (lan) bandwidth or cpu bandwidth? Can someone shed some light on this? Thanks

bandwidth is referring to network, you would get a “This server is not powerful enough to play x media” if it was cpu resources.

Do you have a max Upload speed set in your server settings?

under Remote access? I do not have remote access enabled .