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I had this issue for a while. Turns out the fix for me was to wear the stap a little lower on my chest.
I try to line up the top of the strap a touch below the bottom of my sternum. This means the two sensors are sitting on my ribs rather than the base of my pectoral muscles (the movement/contraction of which might have been confusing the HRM previously).
Ok, so I'm not actually fussed about HRM data anymore, but seeing as I've spent money buying the fucking monitors, I wouldn't mind if they worked once in a while. I've tried Garmin, Wahoo, Polar, swapped fresh batteries, wet the electrodes with spit, water, electrode gel. It does it regardless of inside or outside, Bluetooth or ANT+, jersey or no jersey. It basically just registers my HR and then flatlines at a value forever.
The only thing I can think of is that I have a slight arrhythmia, which might be confusing the sensor. Any ideas?