Event ID 10003

We are getting event ID 10003

The transport process failed during message processing with the following call stack: System.InvalidOperationException: This kind of next hop solution should not be shadowed.  Delivery Type : 'SmtpRelayToTiRg'.
   at Microsoft.Exchange.Transport.ShadowRedundancy.ShadowRedundancyManager.EnqueueShadowMailItem(TransportMailItem mailItem, NextHopSolution originalMessageSolution, String primaryServer, Boolean shadowedMailItem, AckStatus ackStatus)
   at Microsoft.Exchange.Transport.RoutedMailItem.Ack(AckStatus ackStatus, SmtpResponse smtpResponse, Queue`1 recipientResponses, IEnumerable`1 recipientsToTrack, MessageTrackingSource messageTrackingSource, String messageTrackingSourceContext, AckDetails ackDetails, Boolean reportEndToEndLatencies, Nullable`1 retryInterval, String remoteMta, Boolean shadowed, String primaryServer, Boolean resetTimeForOrar, Boolean& shouldEnqueue)
   at Microsoft.Exchange.Transport.RemoteDelivery.RoutedMessageQueue.AckMessage(RoutedMailItem routedMailItem, Queue`1 recipientResponses, AckStatus ackStatus, SmtpResponse smtpResponse, AckDetails ackDetails, Nullable`1 retryInterval, MessageTrackingSource messageTrackingSource, String messageTrackingSourceContext, LatencyComponent deliveryComponent, String remoteMta, IEnumerable`1 readyRecipients, Boolean shadowed, String primaryServer, Boolean reportEndToEndLatencies)
   at Microsoft.Exchange.Transport.NextHopConnection.AckMailItem(AckStatus ackStatus, SmtpResponse smtpResponse, AckDetails details, Nullable`1 retryInterval, MessageTrackingSource source, String messageTrackingSourceContext, LatencyComponent deliveryComponent, String remoteMta, Boolean shadowed, String primaryServer, Boolean reportEndToEndLatencies)
   at Microsoft.Exchange.Transport.NextHopConnection.AckMailItem(AckStatus ackStatus, SmtpResponse smtpResponse, AckDetails details, MessageTrackingSource source, String messageTrackingSourceContext, LatencyComponent deliveryComponent, String remoteMta, Boolean shadowed, String primaryServer, Boolean reportEndToEndLatencies)
   at Microsoft.Exchange.Transport.NextHopConnection.AckMailItem(AckStatus ackStatus, SmtpResponse smtpResponse, AckDetails details, MessageTrackingSource source, LatencyComponent deliveryComponent, String remoteMta, Boolean shadowed, String primaryServer, Boolean reportEndToEndLatencies)
   at Microsoft.Exchange.Protocols.Smtp.SmtpOutSession.AckMessage(AckStatus ackStatus, SmtpResponse smtpResponse, Int64 messageSize)
   at Microsoft.Exchange.Protocols.Smtp.BdatSmtpCommand.OutboundProcessResponse()
   at Microsoft.Exchange.Protocols.Smtp.SmtpOutSession.HandlePostParseResponse(SmtpCommand command)
   at Microsoft.Exchange.Protocols.Smtp.SmtpOutSession.InvokeResponseHandler(SmtpCommand command)
   at Microsoft.Exchange.Protocols.Smtp.SmtpOutSession.StartProcessingResponse(Byte[] buffer, Int32 offset, Int32 size, Boolean overflow)
   at Microsoft.Exchange.Protocols.Smtp.SmtpOutSession.ReadLineComplete(IAsyncResult asyncResult)
   at Microsoft.Exchange.Net.LazyAsyncResult.Complete(IntPtr userToken)
   at Microsoft.Exchange.Net.NetworkConnection.InvokeRecvCallback(LazyAsyncResultWithTimeout asyncResult, Object result)
   at Microsoft.Exchange.Net.NetworkConnection.ReadLineDataAvailable(IAsyncResult asyncResult)
   at System.Net.LazyAsyncResult.Complete(IntPtr userToken)
   at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state)
   at System.Net.ContextAwareResult.Complete(IntPtr userToken)
   at System.Net.LazyAsyncResult.ProtectedInvokeCallback(Object result, IntPtr userToken)
   at System.Net.Sockets.BaseOverlappedAsyncResult.CompletionPortCallback(UInt32 errorCode, UInt32 numBytes, NativeOverlapped* nativeOverlapped)

and event ID 4999
Watson report about to be sent for process id: 2020, with parameters: E12, c-RTL-AMD64, 14.01.0289.000, edgetransport, M.Exchange.Transport, M.E.T.S.ShadowRedundancyManager.EnqueueShadowMailItem, System.InvalidOperationException, 8f0f, 14.01.0289.001.
ErrorReportingEnabled: True

We have SP1 Rollup 3 installed.  

Any Ideas?