back button and recent apps button not working - Galaxy A3, A5, A7, A8, A9 Q&A, Help & Troubleshoot

Hallo ,
Recently i buy Samsung galaxy a3 2016 , but i have problem with back button and recent apps button not function , the problem shows this week when i power off the phone. When i turn it on again back button and recent button not work. Any solution s for this problem?
Thank you
Regards

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Problem with fingerpint sensor/ home button

Dear !
I am user of OnePlus 2 and I have problem with my home button. It is well known problem, but what I should do in such situation - send it with warranty ?
Sometimes id doesn't work and I need to touch it many, many times before it will star working.. :/ I was testing meizu mx5 and there home button was much better. What I should do?
https://www.youtube.com/watch?v=ePAjihJJbhg - here is my problem
Everyone knows there is an issue with sensitivity of home button. Hopefully this will be solved by future OTA updates by Oneplus. Till then use on screen buttons or set screen off on long press of Home button and Camera on double tap(Kinda works for me).
fortunately home button is working fine in my phone
but once i changed the double tap functionality to turn the screen off then i observed battery drain
so switched back to do nothing on double tab
Interesting, I have this problem but in reverse. Its activating the home button without me touching it. i tried wiping the button with a cloth but no luck. Had to switch to on-screen buttons. Anybody have a solution?

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hi there i updated my s4 and the back button stopped working is there any way to fix this
But the menu button works? Cuz usually it affects both.
http://forum.xda-developers.com/galaxy-s4/help/problems-official-update-signal-soft-t3250132

Power button problem

Hi all,
I have accident on sea where one wave splashed a bag where my phone was. After small problems with "laggy" buttons everything went fine and my phone worked correctly except power button. It doesn't react. I couldn't even restart the phone. And when my battery was used I coudnt turn it on. I tried to press volume up + power button million times, or all 4 buttons, and somehow I manage to turn it on again while still I was on vacation. Few times I have entered Android recovery screen, and Power button worked perfectly there (I managed to press power button and select reboot device). And after the phone turn on power button would usually works few minutes and then it would died again.
I have installed software for simulation of power button and it worked ok. This morning somehow I decided to turn off my phone, and I couldn't even imagine what kind of problems I will have to turn it on again. Whole day I am trying to turn it on, but it doesn't react. When I pull in charger then it shows regularly battery status (70%). I am desperate :crying:
I am trying to google or find any solution how to bring it ON again without power button, but without success
Is there any way how could I turn Samsung galaxy S6 Edge Plus without power button?
And what you think, is this some kind of software problem, and maybe some factory reset or flashing might help? Or it is more likely hardware problem?
Many thanks in advance.
Can anyone help me?
I have just found this article which might help me:
How to turn ON Galaxy S6 without using the power button:
When the Galaxy S6 or Galaxy S6 Edge is turned off, press and hold the volume button for a few seconds.
While holding the volume button, connect the Galaxy to a computer using a USB cable.
Wait for your phone to boot to Download mode.
Then press down on the volume rocker to cancel the operation.
After the operation has canceled, the Galaxy will reboot and turn on.
You have successfully turned on the Galaxy S6 without using the power button.
source: http://recomhub.com/blog/how-to-turn-on-and-off-galaxy-s6-without-power-button/
But somehow this doesn't work for my phone? First I wasnt sure which volume button should be pressed, so I tried with both in all combinations and still cant get into Download mode.
But I am glad that samsung had created some workaround if power button is not working. THis used to work on older models I guess.
Is there anyone who might know the way how to turn on phone without power button?

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Hi everybody.
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The phone is freezing and heavy

Hello guys, I have a problem with my Galaxy Note 3 phone. Touch no longer works well. When I touch the phone, it does not respond at the same moment. It responds about two seconds later. The matter itself is with the touch buttons, the volume up and down button, the power button and the home button, the touch is a press extended on the screen, the problem I only face it in the operating system, but when I close the phone and go to the menu through which we format the phone, the volume up and down button and the power button are working normally. I temporarily solved the problem by installing another operating system, but after a week the problem returned again
Here is a video about the problem that I face
https://youtu.be/t6jzcUCWbbQ
I can't use my phone please help me
Galaxy note 3 n900 h3g
Suggest you keep to one thread.
https://forum.xda-developers.com/galaxy-note-3/help/problem-touch-t4173779

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