i have 2014 IS350, with iphone 7 plus. anyone having issues with the connection. i had the 6 plus previous and i dont remember it dropping so much. i am listening to music and it keeps cutting out. i can be on pandora or whats saved on my phone and it same issue.
also when i receive a call. after the hangup my volume on my music goes up after it starts back up.

 

Our 2014 does take awhile to pick up the BT connection it seems, but I don't think it cuts out ever. My 2016 has no issues. Both cars it's with Iphone7.

As for volume, far as I know it holds separate volume for calls and for music. So regardless what you did with your volume during a call, when it hangs up it will go back to whatever volume the music was at when it paused for the call. I could be wrong, but that's just what I've noticed on my cars.