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Different (and annoying) issues with Garmin Forerunner 645 music: turning on by itself, disconnecting from headphones and wrong pace and distance

Hi,

I have had different models of Garmin and used to be a brand fan. Not anymore. Garmin Forerunner 645 Music has been a pain. 

Besides tracking incorrectly my races (my last marathon had 1km splits of 0.5 km; total marathon distance of 44.2km) and paces, it now keeps turning on by itself, even when stored, and disconnecting from headphones. I did a hard reset, but nothing seems to work. 

Any advice is greatly appreciated. Thank you!