Thank you, Paul and Jim, for your helpful replies.
Paul, I can't find any link or button on lexus.com for "technical". Maybe I'm overlooking it. For TIS.com, since there is a charge, I'll ask the CDC at the local dealer to use it if necessary.
Jim, great information and detail. I'm still asking the local dealer to find out why I get inconsistent behavior from BT Audio. You have given me some ideas if Lexus can't/won't eventually provide a permanent solution. Paul is right about my technical background: these devices all work from instructions. If it works as expected sometimes, but other times not, then an instruction was either missing, not sent, not received, or not understood. If I or the CDC at Lexus can hook up with a BT expert, then maybe we can figure out if the instruction that isn't working is because of my car or because of my phone.
In the meantime, maybe someone else will post a solution. I certainly will post the solution if I get one.
I will definitely look into DockNDrive so I can at least more easily view my favorite traffic app more safely!
Thanks again!