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Last couple weeks I haven't been able to power down my iPhone.
1) I press & hold the power button until the power off slider appears.
2) I slide the slider to power off.
3) iPhone displays the 'spinner' while shutting down.
4) iPhone goes blank for 500-1000 ms.
5) iPhone displays the white apple logo and reboots.
I first noticed this on a flight last week.

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