What's wrong with the forum?

It seems whenever it's peak time the site starts dying with errors, like this one:

[phpBB Debug] PHP Notice: in file /var/www/callofduty.com/library/System/Cache/ObjectCache.class.php on line 257: Memcache::get() [function.Memcache-get]: Server 216.174.100.105 (tcp 11211) failed with: Connection timed out (110)

Need more lumber?