We are getting following error while running multiple reports on schedulers in BI4.0 SP7.
Could not save the document to the repository for the following reason: [repo_proxy 30] DocumentFacade::uploadBlob - Query execute has failed : Error occurred while attempting to reconnect to CMS : Not a valid logon token. (FWB 00003)
If you need a permanent solution then raise a ticket with SAP.
they will analyze your landscape and look into your CMS logs for the root cause.
We had a similar issue before but SAP cannot provide a complete solution on this. Right now we upgraded to 4.1 and waiting to see if it is a bug or issue with the landsacpe.