Universal Media Server | Forum

There's no sign of any communication with the TV (192.168.86.86) in "dbg1". "dbg0" lacks most of the information needed to learn anything, since it's not made in "trace" mode.

In both logs, a Chromecast on 192.168.86.81 is found, which indicates that the Windows firewall probably isn't the problem (the firewall usually blocks all devices). My best guess is that there's a problem with your network/router or with the TV itself. Sometimes restarting the router can solve "mysterious issues" that arise out of the blue.

My Samsung UE46F6400 behaves the same. sometimes it shows UMS but it seems random when it does, I use a PS3 as my main media player so never bothered me.
Maybe Samsung devices are not very good about announcing themselves on a network, or maybe your config may need tweaking if it is not matching correctly.