Vista - Dell Bluetooth 350 problems on Vista

I have a Dell laptop, with a Dell 350 Bluetooth adapter. It works most of
the time, but sometimes it stops working, and when this happens, the only
way to fix it is to force the machine off and on. Even if I click
'shutdown', it
closes the desktop and starts to shutdown, but never leaves the 'shutting
down' state, so I have to force the power off. I've waited a few hours, to
see if it would ever finish, and it didn't.

Has anyone else seen this problem? Since the machine gets stuck in the
shutdown state, no crashdump is generated, so I don't think any failure
information is being sent to Microsoft. Is there any way to force the system
to crash if a shutdown fails to complete after a certain amount of time?
I've tried the registry settings to trigger a crash from the keyboard, but
nothing happens, maybe because of the laptop BIOS/keyboard.

Thomas

When I say it stops working, I mean the Bluetooth adapter. The laptop
continues to work normally, except that I can't connect to anything over
Bluetooth.