Why my Lenovo K8 phone switched off of it's own and asked pattern for starting?

I set morning alarm in Lenovo K8 and slept at night. In the morning when I woke up, found alarm did not work. Checked the phone and found it got switched off of it's own and asking pattern for starting. It is horrible. How can I keep faith on my phone. It can happen any time and I'll miss important call also.

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