Hi,
I recently picked up a 645 Music and have been having some big problems trying to get sleep monitoring to work.
The watch tracks my heart rate really well during the day in 24/7 mode but no matter what I do I get grey bars in garmin connect and the "No Sleep level Data" message for sleep tracking.
Strangely enough I noticed last night that when it entered my designated sleep time slot (22:30 - 05:45) the heart rate monitor appeared to turn off completely (i.e. the sensor stopped being green and was completely off)
It took a hard reset of the device and a lot of fiddling to get the heart rate monitor to come back on but even then it still displayed "No Sleep Level Data" this morning.
So, does anyone have any suggestions as to whether this is a problem with my individual device or if there is a setting on the watch I need to select to get this to work or something else.
P.S. I noticed that when i had just got the device it upgraded itself to the 2.50 firmware and that it required a reset at that point to make the heart rate monitor to come on. I'm wondering if there is a way to re-flash the firmware in case it was an issue that occured at that time, does anyone know if that's possible?
Thanks