After trying quite a few troubleshooting ideas found here and on Youtube, I have found that disabling the battery optimization on my OnePlus 5T has allowed for more smooth sync and notification functionality with my Ionic. OnePlus 5T runs a version of Android that is based on the Oreo 8.1.0. Under Settings > Battery > Battery optimization > Fitbit App....select the Don't Optimize radio button. The watch and phone have been communicating fine for the last 6 hours or so. I will see what turning off the "Battery optimization" does to my phone battery after a few days of keeping this setting. Never the less....this seems to have fixed all the sync and notification issues i was experiencing previously. I am going to go add back all my other Bluetooth devices to see if they can remain in the Bluetooth list as previous devices I have used. Removing them was one of the troubleshooting suggestions i had tried earlier to no avail.
