sybase数据库连接出现异常

该方法是用来连接sybase数据库的，有时候执行该是可以的，但是有时候执行该方法就会出现异常：
Connection to Sybase server has been lost. All active transactions have been rolled back .

代码：
public DataTable ExecuteReader(string query, string connstr)
{

        using (AseConnection conn = new AseConnection(connstr))
        {
            using (AseDataAdapter adapter = new AseDataAdapter(query, conn))
            {
                adapter.SelectCommand.CommandTimeout = 60 * 3;

                DataTable dt = new DataTable();
                adapter.Fill(dt);
                Command.SQL("Success");
                return dt;
            }
        }
    }

https://jingyan.baidu.com/article/e52e36156bc2d640c60c5124.html