Cannot connect to my local server without internet access

Latest version
Latest version on Nvidia Shield
I am in an area with intermittent internet access and every time my internet drops I lose access to my local server. On top of that, when I do have internet access, but it is very slow, then my media from the local server has trouble playing. It seems that it is not connecting locally. I am on the same network connected via ethernet. I have set the “local” network to include the entire subnet. I am not sure what else to do.

Some info from a PLEX guru which may help: [HowTo] Use Plex with No Internet