Problema con watchdog

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Problema con watchdog

Ricevo questo errore relativo a watchdog. Questo problema impedisce anche l'esecuzione di cron. Da cosa può dipendere?

Warning: MySQL server has gone away query: INSERT INTO watchdog (uid, type, message, variables, severity, link, location, referer, hostname, timestamp) VALUES (1, 'php', '%message in %file on line %line.', 'a:4:{s:6:"%error";s:12:"user warning";s:8:"%message";s:965553:"MySQL server has gone away\nquery: UPDATE cache_update SET data = 'a:51:{s:8:\\"addtoany\\";a:10:{s:5:\\"title\\";s:30:\\"AddToAny Share/Bookmark Button\\";s:10:\\"short_name\\";s:8:\\"addtoany\\";s:10:\\"dc:creator\\";s:8:\\"micropat\\";s:11:\\"api_version\\";s:3:\\"6.x\\";s:17:\\"recommended_major\\";s:1:\\"3\\";s:16:\\"supported_majors\\";s:1:\\"3\\";s:13:\\"default_major\\";s:1:\\"3\\";s:14:\\& in /home/miosito/public_html/includes/database.mysqli.inc on line 1