What is the cause if my IPhone crashes?

I have an iPhone 4S, running ios 6.It has always crashed. No other problems with the phone. No jailbreak. The phone will completely shut itself off and I have to hold the power and home button for it to turn back on. Any permanent solutions other than getting a new phone?

Do you open up too many apps at the same time? Or do you put a lot of things into your iPhone's internal memory?

you should wipe out your safari and other app's cache contents to relieve your RAM space.

or you may refer to the Apple care service for help.

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