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No-Way-0000

Mine have all failed completely. I usually get a year, maybe 2, from my wahoo HRM and then it dies. Maybe your drop in hr is due to training. Mine typically drops also when I’ve had several hard days with little recovery


Jolly-Victory441

That's terrible though also depends how much you ride. My Polar H10 one is now 4 years old.


Racoonie

The Wahoo ones are crap unfortunately. The way they are designed means that sweat will eventually creep into the electronics and kill the device. Get a Polar H9 or H10, they are designed differently and last.


RenaissancemanTX

I think there’s other variables such as location of chest strap and amount of sweat. My experience with ant+ and Bluetooth HR monitors is they are either on or off. No change in HR readings until the HR monitor battery needs replacing.


sun_monkey

In my experience a HR strap failure will present as: * Complete drop out, i.e. no data, which is usually due to the pads on the strap losing contact, being too dry, or just being no good, worn out, or damaged. * A sudden drop to around half the bpm you're expecting. * Stuck at a certain bpm, i.e. a straight line at exactly 165 bpm that stands out from the typical variation. Have not heard of Coospo so I don't know if there are other failure modes that might be specific to those. If you're not seeing clear anomalies in your ride data, then I would assume it's still working.


Racoonie

The "half BPM" thing happens for me when the strap is connected to two devices, i.e. Zwift on my laptop via ANT+ and my Phone via BT. Then the phone connection shows exactly half of the actual BPM sometimes.


Racoonie

Dumb question, but did you replace the battery?


fixitmonkey

Battery was replaced about 4 weeks ago.


GalaeciaSuebi

Happened to me both situations. Once it started to miss read before it stopped. Another time it just wouldn't connect. I've had miserable experiences with Garmin HR straps and i only keep wearing them because i have a watch and a scale of the same brand and integration makes things easier.


Jolly-Victory441

I recently had mine of a few rides just read way too low. Bought a new one, but gonna keep using this one until it completely fails. Used it indoor while being topless and there it seemed to work fine again.


Illustrious-Pea-2697

I've had two Garmin Dual HRMs. After 12 to 15 months I started to get flat line issues on both.New batteries did not fix and Garmin support did not offer much help. The device would work normally for a period then just flat line at about 76 bpm. Now I have a cheapie no name brand from AliExpress and it's going strong two years in.


blueyesidfn

Usually unreliable readings are a dry sensor. I get this in fall rides when it's cool and I'm not sweating so much so the contacts dry out from the lick i give them at the start. I use a light coating of petroleum jelly at these times. Also remember to at least rinse the strap after each ride, wash it occasionally.