php - All instances of Wordpress stops responding on same server? -

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i have server several websites wordpress, mapped virtual-host folder lighttpd. have other websites, non-wp, mapped in same way.

i'm experiencing random crashes of wordpress - ie. 3 wordpress websites stops responding, , have restart server fix problem. other websites unaffected.

i'm @ loss how debug problem. i've looked through error logs, nothing stands out. php and/or mysql problem? server strong box, 8-core, 32gb ram.

error logs dumps:

lighttpd: /var/log/lighttpd/error.log: there nothing above php notice level.

mysql: /var/log/mysql/error.log (quite few of these, whilst site working).:

140320 17:45:46 [error] /usr/sbin/mysqld: table './2famoustv/wp_comments' marked crashed , last (automatic?) repair failed

server: /var/log/auth.log (there's bunch of these, not enough ddos):

mar 20 20:13:42 ubuntu-1204-precise-64-minimal sshd[3535]: reverse mapping checking getaddrinfo no-reverse-dns.metronet-uk.com [109.111.197.158] failed - possible break-in attempt!

i hadn't activated php error log, post results if new crash. appreciate feedback on debug strategies or inspired hunches towards culprit(s). thanks.


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