problem with a new iph 12

hi, ive recently bought a new iph 12, and after adding a card to apple pay, i experienced a problem.

so, when i push the on off button, my phone waits a second and only the turns off. Ive already surfed the internet and found that the problem could occur due to the apple pay. After i read this, i turned double click on the button off. But the problem remained. Then i tried to turn off the emergency call(cause it required triple click), but it also didnt help to solve my problem.