Quocera crumples paper with lines, what is it?

Question

MFP

Quocera suddenly began to leave streaks, but not to stain the sheet, but to crumple it. And there was a characteristic rattle when printing. What could it be? Here is a photo

A photo

p / s / about two or three months ago, the MFP was serviced, the rollers were changed and the stove was serviced, since the number of printed sheets exceeded 50k and the paper was taken very badly. Then everything became perfect, and now only such a problem suddenly appeared

Answer 1

mechanical most likely
, something has fallen off inside,
I would recommend not to print anything else
, take it to the service