BT connection 830 to Samsung S7

Bluetooth connection between my 830 and Samsung S7 rarely happens. I've done everything they recommend. All updates, new version of mobile Garmin Connect, delete previous pairing within the phone, delete previous pairing in the 830, shut down 830 and turn back on, shut down phone and turn back on, etc. I use a Garmin HR monitor but makes no difference if paired or not. Any suggestions?