We recently upgraded an EC2 instance (us-east) to Ubuntu 11.10. Since then, we've been experiencing a seemingly abnormal number of processor hangs. Apache etc continue to run (according to monit emails), but httpd is unresponsive and often/usually sshd as well.
Restarting into a new instance seems to have had no effect. All upgrades have been applied.
Advice / ideas / mockery for missing something obvious?