Zigbee 3.0 certified
The firmvare in the bitronvideo stick must be upgraded to handle (some of ?) the newer zigbee v3 devices.
If not, the device may leave the zigbee network after some seconds/minutes.
Edit: Chris can confirm if this is the case with a debug log
For the firmware upgrade, see: Firmware upgrade the Bitronvideo BV 2010/10 ZigBee USB dongle