Can anyone advise why my Fenix 5 Sapphire keeps dropping out of it's synching with Garmin connect app on my iphone SE (I am using iOS 11.2). Sometime the synching works fine and then the connection seems to get drop and stays dropped. The bluetooth settings on my iphone shows the phone is connected but there is no connection with the Garmin Connect App. I have tried Pairing the phone again but it doesn't seem to work? Any clues