Bluetooth Connectivity Question

Hi Everybody,
I have a 2013 MY Volt without Nav/Bose speakers. I purchased the car new and I apologize if this question has been asked and answered. I was recently given a Samsung S5 smartphone and pared it to my car for bluetooth connectivity. 1st time I have tried a bluetooth connection on my car.
It linked seamlessly and I made several calls to try it while the car was stationary and it worked fine. However, while I was driving, the connection on the other end had a lot of static. I called several people at different times while driving, and they all said the same thing. While speaking to the other person, I could stop the car, and the connection would clear, as soon as I started moving, the connection regained the static (both electric and/or ICE mode). The connection on my end was crystal clear irregardless while stationary or moving. I looked on the forum for answers and the only thing I could find was someone referencing a bluetooth software upgrade "PIC5768" to the vehicle. There was a question from another member that he was told by the dealer, that this only applied to vehicles with NAV. My S5 has been upgraded to V6.0.1 Any thoughts out there.
Thanks