Selphy cp1300 won’t turn on, needs to unplug and replug

Hello,
My Selphy cp1300 is working fine but when I turn it off after I finished my work, it won’t turn on with pressing the power on button. Then I unplug it from the power source and replug it, its turning on normally (with simply pressing the power on button).
It happens every time, what can I do about it?
Thank you.