I think getting one like this every year is a necessary evil. After ten months or a year, I became bad at reading. It came and went, or was unusually low for my efforts. I changed the battery in the sensor and it didn't help. I had this problem with my previous one and bought the whole sensor and strap. It turns out to be a strap. Bought new and the problem is gone. Only at the price of several thousand kilometers driven per year. I agree. Just think of it as a "consumable" in sports.
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