Hardware faliure ?

Hi guys today I was using my nexus 5 and suddenly it turned off ... then about 10s it was dead , I was holding power button but nothing .
After 10s it went to bootloop -> google logo -> rom logo (for about 1s) and it was repeating that .
I was pushing power button rapidly and I got it to turn on somehow .

So I m asking now is it my power button faliure ?

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