Solution

Set [Anti-humidity (Image Dropout Prevention)] to [Active].

User Tools > Maintenance: Print > Anti-humidity (Image Dropout Prevention)

If the problem persists, it may be possible to temporarily evade the problem by changing the paper type and paper thickness settings. The paper type settings can be specified using the machine's control panel, so provide customer guidance accordingly.

User Tools > System Settings > Tray Paper Settings > Paper Type: (tray name) > Paper Type/Paper Thickness