I just noticed that my WiFi is staying on while the phone is asleep. I checked and rechecked (and changed and change back) the settings for WiFi to be OFF whenever the phone is asleep but to no avail. Any ideas? I think this may be what has caused my battery performance to degrade ever since the JB update. By the way, I even reset the phone to factory settings and reloaded everything, but the WiFi stays on.