I've had the 255 Music for 6 months, I've never had any problems, but for the past week, the sleep tracking has stopped working.
My sleep is no longer detected, yet the nighttime heart rate is recorded, the body battery also works. But I don't see the number of hours of sleep, sleep cycles, or HRV...
I haven't changed anything in the settings...
Anyone have an idea?
Thanks in advance.
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