CRM插件出错 - 服务不可用，关闭传输通道。服务器响应为：4.3.2服务未激活

Question

我有一个CRM插件已经工作了一段时间但是最近开始间歇性地抛出以下错误：

Unhandled Exception: System.ServiceModel.FaultException`1[[Microsoft.Xrm.Sdk.OrganizationServiceFault, Microsoft.Xrm.Sdk, Version=5.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35]]: Service not available, closing transmission channel. The server response was: 4.3.2 Service not activeDetail: 
<OrganizationServiceFault xmlns:i="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://schemas.microsoft.com/xrm/2011/Contracts">
  <ErrorCode>-2147220891</ErrorCode>
  <ErrorDetails xmlns:d2p1="http://schemas.datacontract.org/2004/07/System.Collections.Generic">
    <KeyValuePairOfstringanyType>
      <d2p1:key>OperationStatus</d2p1:key>
      <d2p1:value xmlns:d4p1="http://www.w3.org/2001/XMLSchema" i:type="d4p1:string">0</d2p1:value>
    </KeyValuePairOfstringanyType>
  </ErrorDetails>
  <Message>Service not available, closing transmission channel. The server response was: 4.3.2 Service not active</Message>
  <Timestamp>2015-04-21T15:31:20.3902191Z</Timestamp>
  <InnerFault i:nil="true" />
  <TraceText>

知道可能导致这种情况的原因吗？

除了以下代码之外，所有内容都在try / catch中：

IPluginExecutionContext context = (IPluginExecutionContext)serviceprovider.GetService(typeof(IPluginExecutionContext));