Ok, go into device manager and wait for it to happen again, when you hear the usb disconnect sound the device manager should refresh and the bluetooth module should disappear under usb devices and when you hear the usb connect sound it should reappear, if its the same problem I had. If this is the case you most likely need to get the motherboard replaced, I just started having this problem after having my 600m for a year. I tried everything and I ended up having to send it back to Dell last week, it was pretty painless though. Supposedly the bluetooth card is integrated into the board so they just replaced the board and updated the bios 8 revisions and it works perfectly now. Airborne picked it up on Weds. afternoon, I got it back this morning and its all fine now. You're gonna have to call tech support and go through all the software stuff before they let you send it back. Good Luck!

That is correct to everything.  A little message pops up above the bluetooth icon saying something like bluetooth radio is still disabled, blah blah blah.  I hear the sound everytime I see the message.  Eventually I get a USB error and my computer briefly freezes (the start menu mainly).

I wonder how we can resolve this?  It is getting very annoying.

Heh, I think I just finished dealing with the same problem. So basically you hear the usb disconnect/reconnect sound randomly and then windows pops up with an error saying usb device not recognized?

BTW, you post on genmay right?

This sounds very familiar. I have been using Bluetooth without issue on my Inspiron 600m for about two months. Shortly after (but not immediately) upgrading to the newest software and firmware recently made available on Dell's website, my Bluetooth stopped working and I received the "USB Device Malfunctioned"/"New Hardware Found" messages repeatedly in my system tray. Looks like I'll be sending the system back for some maintainance.

Doug