Lumia 920 with Cyan 8.1 connecting to BT HRM?

[k2bikerider]

​I have a Polar BT HRM, that I've had since 2011 that I used with my Android phone, I switched to a Nokia Lumia 920 so I stopped using it, and went to a basic HRM watch that I manually entered in the Ave HR & Max HR into Runtastic. Since the Cyan WP 8.1 update I was hoping to utilize this Polar BT HRM again if it is compatible. It will pair, but it will not stay connected. If it will not work, I will purchase another BT HRM, but would like to know what works best with Nokia Lumia 920 w/ Cyan 8.1