Yeah my Garmin Instinct Solar is doing the exact same thing too, like an alarm or abnormal heart rate alert or something else goes off & the Garmin Instinct Solar Smart watch just turns itself off of which this is Very Annoying indeed even know it has the latest software/firmware version update but it still does keep turning itself off, Grrrrr so Very Annoying indeed so Garmin Send out an update to Fix the issue ASAP guys..
