the watch does not respond to touch

the clock does not respond to touches on the screen, the side buttons work. But when I try to unlock the watch and enter the password, they do not react in any way. At first, when I just took the watch in my hands and tried to enter the code, the numbers were pressed on the screen by themselves and very quickly. When the screen went out, nothing happened, then again. I can't unlock my watch and use it. what should I do ?