Keep adding and re-pairing vivosmart4

Have to keep pairing the device, been set up and registered with Garmin. Bluetooth cache cleared, removed previous device from app and Garmin. Am sick and tired of having to pair do many times. When not near phone and watch not connecting, i have to re-pair. This must be fixed and soon before i throw this thing away from frustration!!! Never had this issue with vivoactive4.