[L720] Static/hissing noise when making/receiving a call W10TP?

[paacharon3]

has anyone else encountered this issue? On my Lumia 720 with Windows Phone Technical Preview build 10052, When I'm making/receiving a call, There is A LOT of hissing/static noise, and even on the other side of the line they can hear it too.
Fortunately, this doesn't happen when i'm using earphones/headphones with mic. But i don't always have earphones/headphones with me so it'd be really bad when i need to make calls without headphones/earphones.

Thanks