My drupal Site goes offline with PDOException Error

All of a sudden my Drupal site goes offline atleast once a day with the following error. what’s going on?

PDOException: SQLSTATE[HY000]: General error: 1290 The MySQL server is running with the –read-only option so it cannot execute this statement: INSERT INTO {watchdog} (uid, type, message, variables, severity, link, location, referer, hostname, timestamp) VALUES (:db_insert_placeholder_0, :db_insert_placeholder_1, :db_insert_placeholder_2, :db_insert_placeholder_3, :db_insert_placeholder_4, :db_insert_placeholder_5, :db_insert_placeholder_6, :db_insert_placeholder_7, :db_insert_placeholder_8, :db_insert_placeholder_9); Array ( [:db_insert_placeholder_0] => 1 [:db_insert_placeholder_1] => php [:db_insert_placeholder_2] => %type: !message in %function (line %line of %file). [:db_insert_placeholder_3] => a:6:{s:5:”%type”;s:12:”PDOException”;s:8:”!message”;s:400:”SQLSTATE[HY000]: General error: 1290 The MySQL server is running with the –read-only option so it cannot execute this statement: UPDATE {variable} SET value=:db_update_placeholder_0 WHERE ( (name = :db_condition_placeholder_0) ); Array ( [:db_update_placeholder_0] => a:1:{s:12:"languageCode";s:2:"en";} [:db_condition_placeholder_0] => mollom_languages_expected ) “;s:9:”%function”;s:14:”variable_set()”;s:5:”%file”;s:62:”/home/content/60/4994460/html/vezit.com/includes/bootstrap.inc”;s:5:”%line”;i:983;s:14:”severity_level”;i:3;} [:db_insert_placeholder_4] => 3 [:db_insert_placeholder_5] => [:db_insert_placeholder_6] =>

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