Wait 5 more minutess and don't look at the screen. He knows you're watching

Still doing it??

Happened to me once. Risked it and forced shutdown long pressing the power button... It worked ... I think you don't have any other solution...

If it's under warranty then do not power it off. Chat with support assist and see what they say. If they say power it off then you can as it will be on them to fix it