Affected Products: 
Multifunction: CX92x, XC9245, XC9255, and XC9265
Issue Description:
When making a duplex copy, the first page is printed out just fine but the second page or backside page is printed out with a shaded panel on the left side while dots and lines on the right side.
Note:
Only duplex copy is having an issue and printing duplex works fine
.
Copy Defect SampleSolution:

Power off the printer for a few seconds and power it back on.

Perform another duplex copy to check if the issue remains.

If the same issue persists, printer firmware needs to be updated.
Still Need Help?
Have the following available when calling Lexmark Technical Support;
Printer model(s)
Printer serial number
Toner/imaging unit/waste toner bottle part number and serial number
LEGACY ID: SO8831