Yep I'm having the same with with my VivoFit 2 and Samsung Note 4 as well as my wife with her VivoFit 2 and Samsung Galaxy S5; the issue started occurring right after the most recent update.
Note 4 software version: N910VVRU2CQF2
Android Version: 6.0.1
I spoke with Garmin and they said that Verizon's most recent update has changed something with a data transfer protocol. There is no ETA on a fix.
Very disappointing that this was not caught at a quality gate.
Things I've tried to do to resolve it:
Clear app cache/data
Uninstall / reinstall the Garmin Connect App
Turn Bluetooth on / off
Turn airplane mode on / off
Unpair the device (now I can't pair it again!)