Attempted to read past end of the stream error in MySQL

I'm running into a problem with MySQL where I have the following error.

MySqlClient.MySqlException: Fatal error encountered during command execution. ---> 
MySql.Data.MySqlClient.MySqlException: Fatal error encountered attempting to read the resultset. ---> 
MySql.Data.MySqlClient.MySqlException: Reading from the stream has failed. ---> 
System.IO.EndOfStreamException: Attempted to read past the end of the stream.

This error occurs when I have this running overnight. And it happens infrequently, so it is hard to track down WHY it's happening. I am using .NET 3.5 with MySQLConnector 6.2.4.0.

I am running it using the following code.

        public DataSet Read(String query, List<KeyValuePair<String, object>> parameters)
    {
        MySqlDataAdapter adapter = null;
        DataSet returnVal = null;
        if (query != null && query.Length > 0)
        {
            try
            {
                returnVal = new DataSet();
                if (connection.State != ConnectionState.Open)
                {
                    connection.Open();
                }
                query = SQLHelper.formatSQL(query);
                MySqlCommand command = buildCommand(connection, query, parameters);

                Stopwatch stopwatch = new Stopwatch();

                command.CommandTimeout = 120;
                adapter = new MySqlDataAdapter(command);
                log.Debug(adapter.SelectCommand.CommandText);
                stopwatch.Start();
                adapter.Fill(returnVal);
                stopwatch.Stop();
                if (stopwatch.ElapsedMilliseconds < 150)
                {
                    log.Debug(stopwatch.ElapsedMilliseconds + "ms to run query");
                }
                else
                {
                    StringBuilder sb = new StringBuilder("");
                    if (parameters != null)
                    {