I seem to have problems with my mic bc people indicate they have a hard time hearing me when I'm driving. tested mic, seems like its a bit jumpy (ie: I'm either full on or really low, can't seem to get a steady signal). Does this sound like a mic prob? Also, having issues getting out of nav diag mode. I get to the screen RE removing key to reset, but when I do so, it doesn't reset. The other screeens (4x4 and settings) still work, but now the navi screen remains in diag mode. Any ideas?