I have a Multisport Cardio, with a Wahoo Blue HR heart rate monitor strap connected. It has worked fine up until recently, when the reading started jamming part-way through my activity. Typically this will happen after 5-10 minutes of the activity - the reading is mostly frozen, with the odd fluctuation. It was an intermittent problem, but is now happening every time.
Troubleshooting I've done so far:
*Changed battery - no change in behaviour
*Paired HRM strap with another device (Strava app) - HRM works fine with this method, which makes me think the HRM itself is functioning ok
Have now reset the phone to factory settings as a next step to see what happens. Is there a chance a latest firmware update may have thrown it off?
Any ideas of what to do beyond this? There appears to be some communication problem between the 2 devices, like it's blocked. The reading never drops completely (I never get a dotted line reading), so the connection is there....