Nokia 6230

I have a new 6230 and bought a Moto HS820. They paired fine and it seems to work well, but on certain calls I make, there is a distortion in the Bluetooth connection or something. When the person talks, there is a garbled background noise coming through as well. If I turn the Headset off, it isn't there anymore in the conversation. Also, some calls come in just fine with no issues at all. Does anyone have any reasoning for this? Is it because my phone is 1.1 and the moto is 1.2? Any help would be great!