i've been fighting these same issues....in fact sometimes my BU-353 will not lock on after resuming from hibernation, but if I have the pc go to sleep and resume it will work, or in other cases I give up and have the car pc reboot. this is with and without xport. i haven't had a chance to try disabling power options for the usb root hub, as i've seen that mentioned sometimes. also, i wonder if it's an issue with hybrid sleep? do you have it enabled as that's what I use.