Thanks for your patience. I would suggest you do two things.
1) Clean the ADF Pick.
2) Reset your Printer.
How to clean you ADF Pick Rollers :
a) Open the ADF cover
b) Lightly moisten a clean cloth with distilled, filtered, or bottled water
c) Clean the ADF cover and the rollers. Please use a separate cloth to clean the Separator.
d) Firmly close and check if its working.
How to Reset :
If cleaning does not work. Please do a reset.
a) Without turning the printer off, disconnect the power cord from the rear of the printer
b) Wait for 30 seconds, and then reconnect the power cord to the rear of the printer.
c) Press the power button to turn on the printer, if it did not power on automatically.
Please try and let me know.