My iPhone 4s won't shut off, it just restarts after a few seconds?

When I shut my phone off I slide the "slide to power off" thing it's circle pops up like its shutting off and then after a second the apple icon pops up and the phone turns back on.

Probably your power button stuck in there or something… Or maybe you r holding your home button as well cuz if you hold the power button and home button iphone restarts instead of shut down.

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