Rebooting WiFi router did the trick. Thanks!@JokkeW
Try any or all of these:
- on your Android device, turn WiFi off then back on
- reboot your WiFi router (and any eventual intermediate network switches and/or WiFi repeater)
- make sure your WiFi router firmware is up-to-date
- on you WiFi router, look for a setting called IGMP snoopping, and if you find it, disable it.
- restart miniDLNA