i have this type of issue too-usually happens occassionally after we've driven over 1 hour. and sometimes the "button area" under the radio display goes dark - and i have to turn on/off the radio.
dealer wants another video, but who can take videos while driving?
there is a software update - but my VIN was not listed, per service, so i'm back to attempting to get video.
i have had my vehicle almost 14 mths, just at 8000 miles - flashing issue has probably happened 12 times.
i also reboot my HU monthly - like rebooting your phone or computer - clears stuff up, sometimes engine shutoff/on does it too.
good luck