My ZTE NUBIA Z9 Mini is somehow dead

Hello, I am new here, I do not know if I post in the right section, so please show understanding.
I have a ZTE NUBIA Z9 Mini, with no issues to my knowledge so far. Now its like it is dead. Here I note what happened in the last 2 days.
Wednesday afternoon, my phone was fine. It let a sound warning for low battery at some point. I forgot to charge it, so it shut down. The next morning it did sound the alarm I always set to wake me up - as its supposed to, even when its shut. That indicates...

My ZTE NUBIA Z9 Mini is somehow dead

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