Hello, We have some Xerox C405DN, 6515DN machines. Unfortunately, it is becoming more and more common for the devices to scan more and more crookedly due to the feed. The first is already 2 degrees offset, the second 4 degrees. If I put 8x 80g sheets into the feeder, the 8 sheets are offset by approx. 10-15 degrees. The paper is in the feeder and the sheets are fed normally one after the other. I have already replaced the feed rollers on two printers, but there is no improvement. The warranty has expired for many of them What can I do?