The current rule of Bluetooth is that a Bluetooth device can only be actively connected to one other BT device at a time. The QH2 Bluetooth Hub can be paired with up to 8 different devices, but it can only "talk" to one at a time.
If you walk more than 30 ft away from the QH2 while wearing your streamer, there is a good chance the devices will disconnect. The QH2 should re-connect with the streamer once you are back in range. If you are away from your QH2 for more than 10 minutes, you will probably have to manually re-connect. Since the QH2 is the "leader" in the Bluetooth relationship, you will probably have to tap the silver button on the QH2 to re-establish the connection. The easiest way to avoid having to re-connect is to leave your streamer by the QH2 when you walk away. That way, the two devices will not drop the connection.