It looks more like a crash of the kernel driver for your wifi card... I have just experienced a similar problem, I will test tomorow if removing network-manager solves it. Uneducated guess: if it is "just" a driver problem, blacklisting r8187 should also solve the problem (I planned to do it but ran out of time). I will try blacklisting it and removing network-manager and comment back later.
-- (Feisty) NetworkManager makes system unusable, seems to have problem with dbus https://launchpad.net/bugs/83013 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
