Comment 39 for bug 139070

Having similar issues with rt73usb on Ubuntu 7.10, connection seems to last sometimes as long as 24 hours, till any heavy downloading occurs then cuts out and won't reconnect unless you shutdown and boot up again, pressing Restart doesn't fix it either. Only a clean shutdown.

:~$ lsusb
Bus 005 Device 002: ID 0db0:6877 Micro Star International

Had similar issues on Feisty, had to get rid of NetworkManager and manually configure it...