Dear Khun Sirirat,
Due to Hp_M602 at toner cartridge is very low or out of ink. hence user have cancelled the Hp_M602 and stop using temporary work and maybe confuse with printer name. Go through the user who have had problems over night maybe they are miscommunication during night shift krub.
Dear K.Viz
Please look into this matter and do the needful.
Should you have further queries, please do not hesitate to contact us.