iOS 9.3.3 Bluetooth issue

SInce installing the 9.3.3 update, I am having problems with Bluetooth in my car. I am able to make and receive calls, but while talking there is a consistent surge type interference that breaks up the conversation for both me and the person I am speaking to. I tried deleting my phone from the car and forgetting the device on my phone, and then pairing the device again, and same issue. When I switch the call to handset mode, the connection is perfect. My daughter's phone without the iOS update works fine.