Sony xperia Z3 Compact: Display goes to sleep after a few seconds

I charged my phone this morning and found that since then the display goes to sleep after a few seconds.

I need to unlock the screen after I push the power button to wake it up again.

I've checked the Sleep setting and turned it to 5 minutes.

Any ideas on what the problem may be and how to fix it? It's difficult to troubleshoot when I have to keep waking the display up.

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