My DWA-142 does not wake up after the computer has been to sleep. I have to unplug it and then plug it back in (or disable and then enable it). My previous USb wireless adapter had the same problem, but a Microsoft patch and Registry edit fixed it. After I upgraded to the DWA-142, the patch and Registry change don't help.
I have been hoping for updated Vista drivers as a possible solution. Vista isn't exactly new any more, so I think it is pretty inexcusable that there isn't a non-beta Vista driver. I even tried Vista SP1 to see if it would fix the problem, but to no avail.
The computer is a home entertainment PC, so letting it sleep when not in use is critical.