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Take the battery out, flip it and put the cover back on and hold it there for a min. It'll reverse the polarity and (one you've put the battery in again) have it working again, for a bit.
The Garmin straps are shit. TBH it'll save a lot of faffing if you just buy one that has nothing to do with Garmin. These work perfectly even on ant+.
miro_o
My HRM is crapping out, and either not registering any heart rate or giving a wildly lower BPM than expected. Changed the battery but still no joy.
Return it to Evans where it was bought, or send it straight back to Garmin themselves? Who is gunna fix the issue quicker?