Wireless not reconnection always.

I have a dell D6000 laptop. XPSP3, AVG, ZoneAlarm, Windows Defender.
The wireless is usually connected. But now and then I just see a popup
saying its connected. I never see the status go off, just see it
"connected".
But then now and then the pop up shows, not connected. And it won't
automatically (though its set to) reconnect.
I can open the dialog and click my router and say connect, it will
prompt me for the ****** key and I just okay it and it plays a bit,
acquires network address, and is connected. Just like I want it to.
But I've tried waiting for 30 minutes and it won't do it on its own. I
have to sometimes prompt it. Tonight I got a dong, and a note saying
"adapter problems" and it pointed to the wireless adapter. (built in
by the way).

Any ideas? If it did it more than 1 time in 3 days I'd be a bit concerned.