wireless network connection

Googled this up and can't find anything, so I come to /tech support/
On Vista. Sometimes, not always or even often, when I leave my computer idle for a few hours and come back I find the network animation thing in the system tray look as if it can't find any wireless networks. So I go look at the network connections thing and it says the wireless network connection is disabled. And no matter how many times I try to enable it again it stays disabled until I reboot, then it works normally again.
It used to do this about year ago but then stopped for ages, I just upgraded to Vista Ultimate (from Home Premium) and it just did it again last night.
Any idea what's going on?
And the weird thing is, when it does this the ethernet cable will work fine, so it's just fucking up the wireless.

As specific as you are trying to be, that is really vague. So off to generic responses: try reinstalling your drivers, make sure the wifi switch is in the ON position if you have one.

I've tried flipping it on and off a few times to no avail, updated the driver to a newer one. any way I can be more specific?

Maybe add what kind of laptop you've got, but I really doubt that I'd be of any help. Maybe try using the windows wifi program if you're using the 3rd party wifi manager. Try thinking back to any updates or changes you may have made, you might have to reinstall just to save the trouble of all that crap.

Try loading up a live linux cd like Ubuntu or openSUSE, if you are lucky enough for it to have the drivers already in and working you'd be able to test it out and be sure that it isn't a hardware issue.