Thread was being aborted

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WCF

In my ASP.Net web application, one of the function is calling the WCF service that has been developed by .Net framework 3.0 using VS2005.It works fine on production and user can make request 8 times(calls) between client and service after that the web application got hanged and generated the following error message. But it works fine on development even more than 8 requests.
I given the proxy time out 20 min in the client side proxy setting.

Error message:

System.Threading.ThreadAbortException: Thread was being aborted.     
at System.Net.UnsafeNclNativeMethods.OSSOCK.recv(IntPtr socketHandle, Byte* pinnedBuffer, Int32 len, SocketFlags socketFlags)  
   at System.Net.Sockets.Socket.Receive(Byte[] buffer, Int32 offset, Int32 size, SocketFlags socketFlags, SocketError& errorCode) 
    at System.Net.Sockets.Socket.Receive(Byte[] buffer, Int32 offset, Int32 size, SocketFlags socketFlags)  
   at System.Net.Sockets.NetworkStream.Read(Byte[] buffer, Int32 offset, Int32 size)  
   at System.Net.PooledStream.Read(Byte[] buffer, Int32 offset, Int32 size)    
 at System.Net.Connection.SyncRead(HttpWebRequest request, Boolean userRetrievedStream, Boolean probeRead)  
   at System.Net.Connection.PollAndRead(HttpWebRequest request, Boolean userRetrievedStream)
     at System.Net.ConnectStream.PollAndRead(Boolean userRetrievedStream)
     at System.Net.HttpWebRequest.EndWriteHeaders(Boolean async)   
  at System.Net.HttpWebRequest.WriteHeadersCallback(WebExceptionStatus errorStatus, ConnectStream stream, Boolean async) 
    at System.Net.ConnectStream.WriteHeaders(Boolean async)   
  at System.Net.HttpWebRequest.EndSubmitRequest()   
  at System.Net.HttpWebRequest.CheckDeferredCallDone(ConnectStream stream) 
    at System.Net.HttpWebRequest.GetResponse()  
   at System.ServiceModel.Channels.HttpChannelFactory.HttpRequestChannel.HttpChannelRequest.WaitForReply(TimeSpan timeout) 
    at System.ServiceModel.Channels.RequestChannel.Request(Message message, TimeSpan timeout) 
    at System.ServiceModel.Channels.ClientReliableChannelBinder`1.RequestClientReliableChannelBinder`1.OnRequest(TRequestChannel channel, Message message, TimeSpan timeout, MaskingMode maskingMode)  
   at System.ServiceModel.Channels.ClientReliableChannelBinder`1.Request(Message message, TimeSpan timeout, MaskingMode maskingMode)    
 at System.ServiceModel.Channels.ClientReliableChannelBinder`1.Request(Message message, TimeSpan timeout) 
 
    at System.ServiceModel.Security.SecuritySessionClientSettings`1.SecurityRequestSessionChannel.Request(Message message, TimeSpan timeout)   
  at System.ServiceModel.Dispatcher.RequestChannelBinder.Request(Message message, TimeSpan timeout)  
   at System.ServiceModel.Channels.ServiceChannel.Call(String action, Boolean oneway, ProxyOperationRuntime operation, Object[] ins, Object[] outs, TimeSpan timeout)  
   at System.ServiceModel.Channels.ServiceChannel.Call(String action, Boolean oneway, ProxyOperationRuntime operation, Object[] ins, Object[] outs)   
  at System.ServiceModel.Channels.ServiceChannelProxy.InvokeService(IMethodCallMessage methodCall, ProxyOperationRuntime operation) 
    at System.ServiceModel.Channels.ServiceChannelProxy.Invoke(IMessage message)   
  at System.Runtime.Remoting.Proxies.RealProxy.PrivateInvoke(MessageData& msgData, Int32 type)
     at MyWebApp.MYWCFService.IServiceInterface.SelectSerialNumber(SerialNumberAssignmentRequest request) 
    at MyWebApp.MYWCFService.ServiceInterfaceClient.SelectSerialNumber (SerialNumberAssignmentRequest request) 
    at MyWebApp._Default.PopulateSerialNumberDetails(SerialNumberAssignmentRequest request)

Could you please help me to figure out why it causing this error?