DLNA service stops responding upon artists search

[Pe6yc]

Hi, I have an issue with multimedia server.
I have setup indexing and folders for videos, photos and music files
DLNA, mediaserver and indexing services have started succesfully
When I use my DLNA client app (Danon HEOS), it sees DLNA server in servers list
But when I try open artists list (or any other list, tracks, albums etc) client can't get data and shows there's no artists
Right after that media server disappear from servers list.
I need to wait 2-3 minutes and DLNA server appears in list again.
Sometime I can get artists list but when I started playing a track server disappear again and not accesible though music is still playing

[Pe6yc]

Is it possible to edit my posts on this forum? I cannot find the way to edit ones.
TNAS Model: F5-422
TOS: 5.1.37-00031

[Pe6yc]

Is it possible to install other DLNA server then embedded one?