So refilled cartridges as I have done many times. Printed about 12 pages with perfect color when blues started going purple then red. Checked the cartridges and cyan was still half full. Nozzle check showed no cyan on it at all. Tried some head cleanings and some prints, got one good print then same thing happened again. I have 180 mugs to do and can not figure out what is going on. Maybe air in refillable cartridge did something, I have no clue what to do now, been messing around for a couple hours wasting ink and paper.