questo e' parte del log di php stats

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QUERY|26/03/2004 18:40:18|INSERT INTO php_stats_hourly VALUES('18','1','0','2004-03')|MySQL server has gone away
QUERY|26/03/2004 18:40:18|SELECT data FROM php_stats_cache WHERE data>1080322472|MySQL server has gone away
[/code:1:1a464c11f5]

chi mi spiega cosa significa MySQL server has gone away? qual'e' il problema?