Maybe it’s related to that
Phone doesn’t keep bluetooth settings
It affects me similarly:
The first pairing went well, except that the name of the BT device (mobile) did not appear identical in the car, it wrote a sequence of character pairs similar to the MAC. After disconnecting the mobile phone and turning off the BT, the mobile phone did not connect automatically for the second time (“pair automatically” was specified during pairing). I had to re-pair with my cell phone in the car.
Xperia 10 III, Mazda 3