network share on my mac does not always work

I have this setup and can play video from my apple tv 4. It works sometimes and other times Fuse searches and says unable to connect. My apple tv 4 is plugged in to my router via ethernet and so is my Mac so wireless connectivity is not an issue.

Any ideas why sometimes it works and sometimes it doesn’t? Is there some setting I can make to my apple tv or mac so it will work 100% of the time?