DLNA sometimes not available and stops after some time

[Aeious]

I tried the values. Same behavior.

I also tested a lot and I think its a problem specific for the TV. Its the only device that creates a dlna session according to the log.
The behavior of the TV is always the following:
Start of the TV. A DLNA device is shown in the overview of jellyfin.
After 1:30 to 2:00 minutes the Jellyfin DLNA appears on the TV.
After about 15:30 minutes the device in the overview disappears.  
After about 35 minutes the Jellyfin DLNA disappears on the TV. 
The Jellyfin DLNA does not appear again until the TV is restarted.
It doesnt matter if a stream is started or not. If one is started it stops with the disappear of the Jellyfin DLNA 

Al other diveces (smartphone, PC) dont show that bahavior. DLNA sometimes disappear in the windows network for a short time, but I think this is just the way it is displayed in windows. Streaming works fine.

Is it possible that the TV is using an unusual or old authentication method? Strange thing is that it worked fine for a long time before the jellyfin update. The TV was also not updated (its to old for updates ) and other DLNA server are working fine.