Navigator-V software version 2.50 update available this morning.
The update above may help even though there was no mention of your exact issue in its fixes, they sometimes fix many problems that aren't listed, also:
Have you put your Sena in "Phone" mode?
Also clear the cache on your RAZR? Instructions: https://motorola-global-portal.custh...p/30,6720,8417
May also want to try a master reset the Nav-V and start over if all else fails, This is done by removing the GPS from its mount and holding your finger on the bottom left corner of the screen while turning the power button ON at the same time, keep your finger there until the message appears "Erase All User Data?’", and answer Yes.