Help for DLNA desappearing from android

[lwizard]

Someone can help me in inderstanding why minidlna library randomly desappear from my android device? Sometime when I enable DLNA it doesn't show up in Android Bubble UPNP, sometime yes. Anyway after some time (hours, days, minutes) it desappear again and I have to restart service.
service is always running (no crash) so it seems is something in the LAN (conflicts?)..
Is there any log which could be useful?
MiniDLNA log diesn't seem usefull...