It takes memory to clear memory...
These things run a secure disk image overwrite after every job, so if we go with the assumption this issue occurs only after doing a couple/few/plethora of scans in relatively quick succession, then it is likely that the machine is pausing so that the disk image overwrite can finish purging the old scan from memory.
And if that is the case, you have 2 options (3 if you include buying another faster more robust scan solution)
1. Change the machine so it no longer does immediate overwrites after every job, if this works, you have solved the issue, and likely no bad things will happen, unless someone tears apart the printer, takes the hard drive, decrypts the data, and recompiles the files on it to possibly view the documents you scanned. To do that
CWIS > Properties > Security > Image Overwrite Security and set it to Disabled
Then, for safety sake, select Disk Overwrite and set it to something like daily at midnight so the aforementioned corporate espionage guys can only get today's scans when they steal the drive.
And Option 2 would be to try setting it to pdf/a and disable OCR (Image Only), but of course while the file size will be better, it obviously will not be a searchable document, so if that matters, this option is not good at all, but it cuts down a huge amount of processing power and memory required for the job.
