My iPhone 4S Shut Itself Down Randomly?

I was able to boot it back up by holding down the home button and sleep button, but I noticed it was warm (Not hot).

It shut down randomly, on a fully charged battery for no reason as far as I know.So, I was a little worried and Googled it. Someone suggest I turned it on with the home button and sleep button, which I did and it turned back on. But it was warm, and it has never had any problem.

Is this something I should be worried about?

Android phones have a tendency to shut themselves off every now and then if they are not re-started (turned off and back on) every few days. They act like a computer where the system needs to be refreshed every so many hrs. My phones do the same thing. I worried about it at first not knowing what it was.

Whenever Apple devices encounter a problem the shut down or blackscreen for a short period of time to fix itself from whatever problem it is having.

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