I took delivery of a Model 3 on March 30 of this year. At the time, it was running 2019.5.15, but within a day it had upgraded to 2019.8.4, then 2019.8.5, then 2019.12.1 a couple of days ago, and finally to 2019.12.1.1 today. Through all of this, I've had no problems with Bluetooth connections...