This happened after upgrading to dapper, if I remember correctly, but a fresh dapper install fixed it and it never happened again since then (I used edgy and now I'm on feisty). This bug can be closed.
-- Memory consumption very high after several days uptime https://launchpad.net/bugs/46943 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
