Silverlight 调用WCF 远程服务器返回了错误: NotFound

silverlight调用wcf有时很不稳定，同样调用一个方法，有时正确，有时会报远程服务器返回了错误: NotFound。主要问题是：WCF服务本身对数据包进行了限制，最大不能超过65535。可是我想不通的是，当我发送200多记录时，都正常，可是发送一条记录时，才会报这样的错。按数据限制的说法，也说不通，真是头痛。

看一下如何来配置WCF服务器。

 <system.serviceModel>
    <bindings>
      <basicHttpBinding>
        <binding name="BasicHttpBinding_IDataService"  maxBufferPoolSize="2147483647"  maxReceivedMessageSize="2147483647"  maxBufferSize="2147483647">
          <readerQuotas  maxArrayLength="2147483647"  maxBytesPerRead="2147483647"  maxDepth="2147483647"  maxNameTableCharCount="2147483647"  maxStringContentLength="2147483647" />
        </binding>
      </basicHttpBinding>
    </bindings>
    <behaviors>
      <serviceBehaviors>
        <behavior name="MyNetDisk.Web.FileServiceBehavior">
            <serviceMetadata httpGetEnabled="true" />
            <serviceDebug includeExceptionDetailInFaults="true"/>　
            <dataContractSerializer maxItemsInObjectGraph="2147483647"/>　

        </behavior>
      </serviceBehaviors>
    </behaviors>
    <serviceHostingEnvironment aspNetCompatibilityEnabled="true" />
    <services>
      <service behaviorConfiguration="MyNetDisk.Web.FileServiceBehavior" name="MyNetDisk.Web.FileService">
        <endpoint address="" binding="basicHttpBinding" contract="MyNetDisk.Web.FileService" bindingConfiguration="BasicHttpBinding_IDataService" />
        <endpoint address="mex" binding="mexHttpBinding" contract="IMetadataExchange" />
      </service>
    </services>
  </system.serviceModel>