Got my Fenix 6x Sapphire 2 days ago and Heart Rate is not working. Called Customer Support to report the issue (and process a return/refund) but they said that the engineers are aware of the situation and it is a software issue. The rep said to wait until next week for a software update that they will roll out to fix this issue. Please post if you've had similar response from customer service *BTW, it would be great if Garmin can keep us updated through this Forum!