I have movies stored on a harddrive on my network. The player finds the DLNA server(computer), it recognizes the mp4 file types. The 1080p content freezes every 5 or 6 seconds. I have 2 other Sony bluray players that play the same content without any issues(the same movies). I have returned this player and the new one does the exact same thing. If you have this player, try to play your 1080p files( movies) over your network before your return period ends on this purchase.
For their top of the line player to have this many issues is very poor quality control.