SAP Adapter service failing

Hi,

I have created a flow service which internally calls an SAP adapter service (to invoke a BAPI).
This flow service is exposed as a webservice.
Ocassionally the flow service is failing with on of the below two errors. If I re-execute the service with the same data, it runs without any error.
ERROR 1:

ERROR TYPE: com.wm.pkg.art.error.DetailedServiceException
ERROR SERVICE NAME: SAP_Adapter_Services:callZ_BAPI_PROJ_QUOT_MAINTAIN.
ERROR DUMP:
com.wm.pkg.art.error.DetailedServiceException: [ART.117.4002] Adapter Runtime (Adapter Service): Unable to invoke adapter service SAP_Adapter_Services:callZ_BAPI_PROJ_QUOT_MAINTAIN.
[SAP.102.9000] JCo error: (104) RFC_ERROR_SYSTEM_FAILURE - CPIC-CALL: ‘CMRCV’
LOCATION CPIC (TCP/IP) on local host
ERROR connection to partner broken
TIME Mon Aug 22 02:05:43 2011
RELEASE 640
COMPONENT NI (network interface)
VERSION 37
RC -6
MODULE niuxi_mt.c
LINE 928
DETAIL NiPRead (3.56.13.82/3356, hdl 3)
SYSTEM CALL recv
ERRNO 131
ERRNO TEXT Connection reset by peer
COUNTER 6

ERROR 2:

ERROR TYPE: com.wm.pkg.art.error.DetailedServiceException
ERROR SERVICE NAME: SAP_Adapter_Services:callZ_BAPI_PROJ_QUOT_MAINTAIN.
ERROR DUMP:
com.wm.pkg.art.error.DetailedServiceException: [ART.117.4002] Adapter Runtime (Adapter Service): Unable to invoke adapter service SAP_Adapter_Services:callZ_BAPI_PROJ_QUOT_MAINTAIN.
[SAP.102.9000] JCo error: (104) RFC_ERROR_SYSTEM_FAILURE - CPIC-CALL: ‘CMRCV’
LOCATION SAP-Gateway on host SAPPRDEV.PSAMER.PS.COM / sapgw56
ERROR Conversation 96116277 not found
TIME Fri Aug 19 06:03:29 2011
RELEASE 701
COMPONENT SAP-Gateway
VERSION 2
RC 728
MODULE gwxxrd.c
LINE 6278
COUNTER 12235
Is this because of any transient error?***
If so can someone suggest me a way to retry?
Regards,
KRV