Noticed that my phone didn't like pairing with my Tickr HRM. The main change recently being that I had added some BT headphones. So I removed the headphones, turned off bluetooth on the phone, turned it on, and it refound the Tickr. Then tried pairing to the bolt. It took a while, but eventually it paired.
My guess is my phone is at fault, not the wahoo. Either way, works now.
Cheers
J