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If the scanner is connect to Surge protector, try connecting the scanner to wall outlet. Also turn off the scanner and Clean the Scanner glass with lint free cloth
In order to determine if the problem is related to the scanner or to the software installed on your computer I would try your scanner on another computer. If it does the same thing then the scanner is faulty.
This could be one faulty sensor pixel or a speck of dirt on the scanner bar.
It might be worth opening the scanner and carefully dusting the bar with a camera cleaner aerosol.
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