Sony TV HD not showed

Dear All,
from a couple of day kodi 17 on my sony 50w809c doesn’t show hd connected by usb port. Outside Kodi, with other apps, no problem. Google video and VLC works correctly and I can access to my sda1. The problem started when I set my pc (connected via wifi) as dlna server, now the laptop internal HD is showed correctly but I can’t see the one connected direct to usb port on tv.