I'm not sure if this a touch screen issue or a DC one. when playing podcasts in my car with my N1 being charged I will sometimes press play. when I do that, for some reason my finger activates the progress bar and I lose my spot. it's not because of me inaccurately tapping the screen. I'm basically wondering if i'm the only one to experience this, if so i'll chock it up to touch screen issues.
That happens to me sometimes (on n1) where I press the screen but it detects the wrong location. Rebooting always fixes it, sometimes locking the screen and unlocking it does too.
You can set the seekbar behavior in DC to require a long press which might avoid this.