http 500 error

wget dpt:
HTTP request sent, awaiting response... 500 Internal Server Error
2012-05-24 10:00:56 ERROR 500: Internal Server Error.

file error_log dlm current dir:
[23-May-2012 20:02:15] PHP Fatal error:  Allowed memory size of 67108864 bytes exhausted (tried to allocate 72 bytes) in /home4/haxxx/public_html/xxxx.com.my/xxx/libraries/joomla/database/database/mysql.php on line 462

penyelesaian:
file php.ini
memory_limit = 96Mb

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Pernah berlaku, error terus keluar 500. tak de clue lain.
Kali terakhir, 'jos_session is marked crashed and need to be repair'

lepas repair terus ok