2011 Prius Bluetooth Issue with New iPhone 7

I'm having a problem using my iPhone7 in my 2011 Prius. Specifically, although the bluetooth connects, spoken words from Google maps, Apple maps, etc, lose the first 1-3 seconds. So, instead of hearing "In 2 miles, turn left on Maple Street," I hear "...urn left on Maple Street."

Research indicates an A2DP issue, but I don't know what that is or what to do about it. Any suggestions would be helpful and appreciated.

More specifics:

• I can use the phone and music features via bluetooth without an issue.
• If I am on a bluetooth phone call or if I am streaming music via bluetooth, there is no delay.
• There was no issue with my iPhone5S.
• I paired another iPhone7 to the car and got the same issue.
• My iOS is up to date, 10.3.2
• I downloaded a Prius Entune update, but my Prius dashboard software seems to predate Entune and does not recognize the thumb drive. I think my audio system predates Entune?
• Toyota says it's Apple's fault; Apple, of course, blames Toyota.