Exchange Web Service - error while moving mail to other folder

Getting below error.  Some time working fine some time error - while move mail to other folder

Microsoft.Exchange.WebServices.Data.ServiceResponseException: The specified object was not found in the store.
   at Microsoft.Exchange.WebServices.Data.ServiceResponse.InternalThrowIfNecessary()
   at Microsoft.Exchange.WebServices.Data.MultiResponseServiceRequest`1.Execute()
   at Microsoft.Exchange.WebServices.Data.ExchangeService.InternalMoveItems(IEnumerable`1 itemIds, FolderId destinationFolderId, Nullable`1 returnNewItemIds, ServiceErrorHandling errorHandling)
   at Microsoft.Exchange.WebServices.Data.ExchangeService.MoveItem(ItemId itemId, FolderId destinationFolderId)
   at Microsoft.Exchange.WebServices.Data.Item.Move(FolderId destinationFolderId)
   at ExchangeAutoReplyService.Business.ExchangeAutoReply.MoveToSuspectAutoReplyFolder(ExchangeService service))

Getting below error. EmailMessage current = EmailMessage.Bind(service, id); - while binding

Some time works fine some time throws error as follows :

Microsoft.Exchange.WebServices.Data.ServiceResponseException: The specified object was not found in the store.
   at Microsoft.Exchange.WebServices.Data.ServiceResponse.InternalThrowIfNecessary()
   at Microsoft.Exchange.WebServices.Data.MultiResponseServiceRequest`1.Execute()
   at Microsoft.Exchange.WebServices.Data.ExchangeService.InternalBindToItems(IEnumerable`1 itemIds, PropertySet propertySet, ServiceErrorHandling errorHandling)
   at Microsoft.Exchange.WebServices.Data.ExchangeService.BindToItem(ItemId itemId, PropertySet propertySet)
   at Microsoft.Exchange.WebServices.Data.ExchangeService.BindToItem[TItem](ItemId itemId, PropertySet propertySet)
   at Microsoft.Exchange.WebServices.Data.EmailMessage.Bind(ExchangeService service, ItemId id)
   at ExchangeAutoReplyService.Business.ExchangeAutoReply.AutoReplyToSender(ExchangeService service, String mailboxEmailId))

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Jagdish