Turning Bluetooth off and on, on both devices doesn't help either. I haven't tried reinstalling the app yet..
Try rather the tips shown in my first post in this thread. Most likely it is due to some aggressive battery optimizing or safety / privacy parameters of your phone, that the phone OS applied on the app, after the update. Not necessarily the fault of Garmin.
Thank you, but your first post seems to be specific to problems with Huawei phones. Mine is an old Motorola Moto E2 with Android 6.0. I've tried your suggestion looking into the battery saving settings anyway. There is an option to turn battery usage optimzation on or off for individual apps, which I tried with Garmin Connect, but unfortunately that didn't help.
After initial pairing the app with my vivoactive 3, synchronization via Bluetooth works without problems
Sync still works after disconnecting Bluetooth on the side of the watch and reconnecting
Sync no longer works after disconnecting Bluetooth on the side of the phone (I usually have Bluetooth turned off on both devices to save energy and turn it on only for syncing)
From this point on, I'm unable to reconnect the two devices without re-pairing them, which of course I don't want to do every day.
This bug is only happening since version 4.27. I have been using this combination of watch and phone since May 2018 without having this problem, through all of the watch firmware and app updates.
It looks like this issue has been reported by many users in the forum and in the PlayStore reviews.
I hope that Garmin developers will fix it soon so that the next update restores the old behaviour!
For the records, and for anyone who is still seeing the same issues:
After pairing the watch via the phone's bluetooth menu it now works reliably for me too. I previously had always paired it in the app only (which I believe was also what Garmin had recommended?). See also forums.garmin.com/.../1015508
