Disconnect / online sources

Hello guys,

I am using Serviio on the following setup:

PC (Win7) - router (TP-Link TL-WR2543ND) - TV (Samsung C550)
All connected by FTP cables

During watching a movies from local disc, there is no problem at all, but when I am trying to watch something from online sources (Top100.groovy - but others aswell), the session after few minutes disconnects ("Connection to server lost" - I am not sure about the exact phrase, because the TV has Czech menu).
I was trying to search this forum and yes, there are some similar topics, but none of them help me to make the videos work.
In attachemnet please find the detailed log.

I really appriciate any help.

First of all, sorry for my poor enghish.
Same thing was PetrVyhlas reported, is happend to me. I have a Samsung E series 5300 and only for online content every clip I watch stopped before the normal end. Anyway, connection to serviio is not lost, I can whatch same clip again or other, but all of them stopped after a while.
In forum I find this post http://forum.serviio.org/viewtopic.php?f=10&t=9109#p62554 and I change the profile to Sony AVReceiver STR, and as result all clips I tested works perfect!
But this profile d'ont work with media files on local disk (mkv, etc) so I revert back to Samsung C/D/E/ profile.
I'm not so good in reading and understanding profile - XML files, maybe someone whith better skills will try to find a solution!