Should i be worried about my Iphone? It wouldnt turn on?

I've had my new Iphone 5s for about a month now. Brand new. Its been working perfectly up until the other day. I was using it like always and i put it in my pocket (locking it first). A few mintutes later i check my phone, but when i go to turn it on, it wouldnt turn on. I pressed the home button to no avail, then i pressed the power button thinking maybe i turned it off by mistake and still nothing. It was completely off and unresponsive. I then had to force reset it holding both buttons and it turned back on. Its working fine now. But that was super weird. Is this a sign that my phone has a problem?
The battery was full.

Probably not, its basically a computer so weird things can sometimes happen.

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