I have a 2020 Leaf. This is the 4th leaf I have owned and never had this issue prior to this one. When I connect my iphone via bluetooth it readjusts the volume of the Leaf to the volume of the ringer on the phone and links the two together. I generally have my ringer volume set to 75-100% on the phone. When I am in the car and get a text, the ding is excruciatingly loud. I turn the car volume down to a reasonable 10-25% via the buttons or the twist knob. The rest of the car ride is fine for volume. However, when I get out of the car, I now miss many phone calls and texts because the car changed the ringer volume to the 10-25%.
Like I said, I have never had this issue, even with the 2018 model I turned in for the 2020 model. I also don't have this problem with any rental car I link my phone too via bluetooth. This problem is specifically with the 2020 Leaf I am leasing.
I do not use Carplay because I frankly have no desire in the year 2020 to plug my phone into the car everytime I get in/out and have a cord constantly plugged in (unless while I am charging the phone on longer trips)... big disappointing miss for Nissan...