I can confirm this bug. When running any bittorrent client (gnome- btdownload, bittornado, azureus, etc) on a wireless connection, if anything else is used to access the internet (including web browser, synaptic, and updates), X locks up after varying time intervals (sometimes 15 minutes, sometimes immediately, and anywhere in-between).
This problem does not occur when downloading a torrent without otherwise accessing the 'net, or if downloading a torrent via hardline (ethernet) connection. -- Torrents freeze system on wireless connection https://launchpad.net/bugs/46845 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs