Yamaha p45 Red flashing light

How to fix yamaha p45, working for how many minutes and then automatically play demo songs and i can't remove it even pressin the grand piano button every key has a different song that plays, when I turned off the piano I tried to turn it on but the red light is blinking. I tried to factory reset it many times, sometimes the blinking stops and will work for a few seconds/minutes and then it will automatically play demo songs again and when I turn it off again, the red light beside the power button blinks