Hi everyone!
I had to restored back to firmware version V1.01 (because the latest update 1.02 didn't work with dlna samsung tv/bluray)
I hope that this bug will be fixed soon:
App - P2P [Bug] - Intermittent P2P client freezing (requires DNS-320L reboot to temporarily restore service)
For this problem:
UPnP - Support for streaming MKV files on a DLNA certified TV
I solved changing the file extension in *.avi (it's a bit 'inconvenient, but it works)
I'd like also to suggest a streaming video player in the web interface (so it will be possible to see the video stored in via internet, using the dynamic DNS)