Are the rollers or glass inside the ScanSnap dirty?
Clean the inside of the ScanSnap.
For details about how to perform cleaning, refer to ScanSnap Help.
Did you apply the setting to reduce vertical streaks?
If you select the [Reduce vertical streaks] checkbox in the scan settings, you can reduce vertical streaks.
Modify the setting in the following procedure:
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Display the scan window of ScanSnap Home on the computer.
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Select the profile that you are using from the profile list.
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Click the [Edit profiles] button to display the [Edit profiles] window.
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Click the [Option] button for [ADF] or [Manual Feeder] in [Feed mode setting] to display the [Feed option] window.
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Select the [Reduce vertical streaks] checkbox.