Iphone 6 plus randomly shows apple logo, should I be concerned?

I have an iPhone 6 plus, and I have had it for a little over a week now, nothing has happened. It has been charging after getting down to five percent and it is now up to almost 40 percent. It randomly showed the apple logo as if it restarted but just seconds before showed a notification form facebook, should I be concerned or will it be okay and I need not to worry? I clicked the power button to lock the screen then unlock it and after a few seconds after unlocking it it went away.

No nothing to be concerned about. They randomly do this. Trust me has happened to me tons of times!

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