recently i've been having some issues with voice command/voice search when my DX is in the car dock. specifically, there seems to be little or no mic gain when i try to use it. i'm maybe 2 feet from the phone and it won't pick up my voice at all. i either have to yell at the phone or lean right up next to it. what's odd is that sometimes, the first time i use voice search, it works great. then subsequent uses don't register at all. does anyone know if there's a way to fix this? e.g. an auto-gain setting that needs to be turned off? thx.