The message usually implies it ran out of memory, but that would typically be scanning to a mailbox, it shouldn't happen on Scan to Network (SMB or FTP).
First step would be to update it to the latest firmware here. Once completed, wait for it to happen again, if it does, come back here and update the post with:
1. How many pages was the job
2. Is OCR enabled
3. Firmware version
4. SMB/FTP/Email or Mailbox
5. Have you run the Secure Disk Image Overwrite
I have a workcentre 7845. During workflow scanning, using different sized originals, 2 to 2 sided, it will sometimes delete the job and in the job log under details it says job deleted due to system image error. Does anybody know why it is doing this or what a fix would be?