Usually either a toner cartridge running out or damp paper.
Take the toner cartridge out and shake it side-to-side to loosen and redistribute the toner inside. If that fixes it, pat yourself on the back for now, but buy a spare cartridge right away.
Take a good look at your paper after printing. If it's severely curled, warped, lumpy, or creased, it may be because moisture in the paper is causing it to bend under the heat of the fuser inside the printer. The same moisture can keep toner from being attracted evenly to the paper. (Laser printers and copiers all rely on static electricity, and moisture dissipates a static charge quickly.)
Don't bother trying to dry damp paper; it will never be flat enough for a laser printer or copier again. Give to your kids for projects or something.
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