Hello , we face the following problem in Biztalk 2010 and WCF SAP adapter

There are intermittent failures to receive SAP documents.  This error causes one IDOC  to be stuck permanently in SAP (in the transmitting state). Once the error occurs, the WCF Adapter faults, and restarts itself. During the restart, the connection is down and all IDOC’s sent during this time end up in SAP's retry queue . The event error 5719 and 5740 are raised: 

The 'ReceiveTimeout' field is already set to 24.20:31:23.6470000  . Please advise a solution .

Thanks, Elena Ellenbogen