Usually it indicates network connectivity trouble and you should check the condition of your network if this error occurs frequently. If the error message includes “during query,” this is probably the case you are experiencing. Sometimes the “during query” form happens when millions of rows are being sent as part of one or more queries. If you know that this is happening, you should try increasing net_read_timeout from its default of 30 seconds to 60 seconds or longer, sufficient for the data transfer to complete.
read here:http://dev.mysql.com/doc/refman/5.0/en/error-lost-connection.html
or check your server configuration once if the same problem exists.
check the following post also.MySQL server at 'reading initial communication packet', system error: 111