For almost a week I have no wireless internet anymore on my Ubuntu computer. In most cases the usb wifi stick was not detected by lsusb.
Since it's the only usb device on this computer, I tried my usb headset to see whether it would be detected by lsusb. Surprisingly I got internet again. However this is not stable after a few restarts the internet was gone again. I tried lsusb once with the headset connected: my headset was visible on lsusb and my wifistick wasn't.

I think that my problem to get a stable connection is really a usb problem.

Can anybody help?