Solution : https://service.sap.com/sap/support/notes/779664 (SAP Service marketplace login required)
Key words :
steadily increasing volume, s_admi_fcd authorization object, support packages attached, receive local versions, trfcdata table check, qrfc incoming queue, qrfc data model, trfcqout table check, qreftid table check, trfcqin table check
Related Notes :
760113 | Delete unprocessed LUWs in the qRFC |