Reported Pairing issues are mainly due to the following reasons:
 80% cases due to one of the devices is NOT in pairing mode or left pairing mode and interfered by other pre-paired device.
>>> solution: Read manual and make sure both devices are in pairing mode (also called discover-able mode) - normally LED fast (2-3 times/sec) flashing. If necessary, reset (clear the paired history) both devices and then pair again
 10% cases due to internal Software confusion
>>> Solution: reset (clear the paired history) both unit and pair again
How to reset Priva III - http://support.avantree.com/hc/en-us/articles/115000456223
 8% cases due to wireless interference due to wifi router, Smart TV, Ruko
>>> solution: turn the TV off and then pair
 2% cases due to defective unit.
>>> solution: replacement