Nothing to do. After I have disabling the firewall, the antivirus (MS), and any possible schedule activity in win7, the bug was happened again. I confirm the time indicated by cooltang; 20-30 minutes after I start the viewing for a avi file, the communication was cut out.
For a few minutes the Samsung device has not seen Mezzmo, then, finally, the icon of my DLNA server is reappeared.
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