I've never seen anything quite like it but Canon has purposefully programmed this printer to clean itself (or eject ink into the collection sponge) constantly. When you load up a new paper tray, reboot the computer, reboot or power on the printer, basically any interaction with the computer or printer forces a one minute cleaning cycle. The result? An unbelievable amount of wasted ink. I can confirm what others here are writing, your ink disappears right before your eyes. Must return this printer now!