HT201412 My iphone 4S switches itself off regularly. The battery is well charged,however. So I don't understand what's going on. Anybody got any idea. Thanks a lots

My 4S keeps on switching itself off for no apparent reason. I've had to restore 3 times already. Does anybody have an idea ? Thanks

I should mention it is ios 6.1.3. The phone has now also started, after rebooting, showing the signal bars next to the wifi signal icon at the top but no "Sprint" type next to the bars as usual. And then after a few minutes it shuts down, shows the black screen with the white apple in the middle for a few moments, comes back up with the Waiting for Activation message, the signal bars pop up and the whole cycle just repeats itself.

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