[Q] Lock Screen not working!! - Android Q&A, Help & Troubleshooting

Hi Guys,
My phone is acting weird from a couple of months.
1. The lock screen doesnt work ie., if I push the power button the screen goes off but when i press the home button or the power button i dont see the lock screen and it directly goes to the home screen.
2. The power button if held for 2 secs the phone switches off without out even giving options like power off or restart or airplane mode.
3. If i click on a notification from the notification window the lock screen appears and i need to enter the passcode to see the notification. Means the lock screen appears whenever i select to read a message or mail from the notification window.
I havent rooted the phone and its running on the stock OS Android Jelly Bean 4.1.2
Model: Samsung GT N7000 - Galaxy Note
Android Version: 4.1.2
Kernel Version: 3.0.31-906407
Please help me get back my phone to the normal condition.
Thanks in advance.

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johnael7 said:
The model of my phone is SGH-T999. It is not rooted (I'm going to root it soon though), its running Android 4.3 and I do admit I've dropped it a few times but it has a cover. It shuts off at the most random moment and restarts itself, and sometimes it won't go past the Galaxy SIII logo before restarting itself once more. Theres a possibility the lock button has something to do because when it stays in that startup loop I play around with the lock button till it finally finishes the startup succesfully, but I don't know how the lock button can make it shut down on its own while its turned on without me touching the "power off" option in the window that comes up.
Click to expand...
Click to collapse
Its the broken power button, long pressing the power button reboots the phone without any dialog.

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