Plex Server Unavailable on Sony BDP-S790



I've been running Plex for a few years without much problem, and with my Sony BDP-S790 picking it up without too many problems via wifi. Recently I shut down my PC (sever) and now the Bluray will not pick it up and just tells me to restart my server over and over (and by the way, that note took me 7 times to read because it literally flashes on screen briefly). Obviously, my Bluray is in my living room with the full 7.1 sound system and large TV, which is where we watch most Plex content. Now we can't. Can you help? (This has been like this for several weeks now>)