As a test, try another DLNA server. I'd suggest Mezzmo since that's what I use and I know it pretty well. Uninstall Serviio and AllShare first so you don't have any conflicts. After installing Mezzmo, start the Mezzmo server and turn on your TV. In Mezzmo, you should see your TV listed in the media devices dialog. Try streaming a few files and see if that's better.