Publication failing with error

I have a scheduled publication that runs everyday, but it fails 3 to 4 times a month with this error. On rerun it run fine.

Can someone please tell me what could be the reason for this failure?

Error Message:
ERROR [PublishingService:HandlerPool-8] BusinessObjects_PublicationAdminErrorLog_Instance_5201061 - [Publication ID # 5201061] - Scheduling document job “Document name” (ID: 5,201,078) failed: session is closed. (FBE60502)
ERROR [PublishingService:HandlerPool-5] BusinessObjects_PublicationAdminErrorLog_Instance_5201061 - [Publication ID # 5201061] - An exception was caught while scheduling the publication. (FBE60203)
ERROR [PublishingService:HandlerPool-2] BusinessObjects_PublicationAdminErrorLog_Instance_5201061 - [Publication ID # 5201061] - An exception was caught while scheduling the publication. (FBE60203)
ERROR [PublishingService:HandlerPool-6] BusinessObjects_PublicationAdminErrorLog_Instance_5201061 - [Publication ID # 5201061] - An exception was caught while scheduling the publication. (FBE60203)


aldrinvijay (BOB member since 2016-09-20)