Galaxy A3 2016 widget bug? - Galaxy A3, A5, A7, A8, A9 Q&A, Help & Troubleshoot

Hi to all,
I have found a peculiar bug in my Galaxy A3 2016 (SM-A310m)
You know you can have up to 5 home screens right?
Well, for some reason any widget that I put on the 5ft screen (the most to the right) disappears after I restart or power off the phone.
It doesn't matter the widget I use or even if I make the 5ft screen the home screen it always disappear after power off or restart.
Any suggestions?

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I press the power button to lock the screen, then several minutes later the tab will go in an endless loop of switching the screen on and off and on and off again until I actually restart the device.
Note I can still unlock the screen and use the tab normally, but as soon as I lock the screen this loop starts, not always, but most of the tries.
Makes it damn near impossible to fall asleep at night.
Does anyone else have this problem and know how to fix it ?
It's a 10.1v and I used Chainfire's method to flash and unlock and then rooted it. It has been doing this before the root/unlock/flash.
EDIT: Ok I found a more sure way to replicate this, any time I just leave the Tab to lock the screen for it self then this loop starts happening.
No matter which way I lock it after that, the loop of the screen switching on and off, just keeps going. When I lock it by pressing the power key or just leave it to lock it self.
It can be cause by any app trying to wake screen. Some media players have such a functionallity
Same problem
Having the same issue with my Samsung GT 10.1v
This is so annoying, I'm considering taking it back to Vodacom.
Are you guys experiencing LCD screen leakage?
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Unlock, than black screen, than normal

Hello all,
Sometimes, when I unlock via pattern my screen, i have black or dark screen for about 3 seconds, than home screen comes from left of the side of display to the right.. Whats might be causing that 3 seconds stuck?
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I have restarted my note 3 and now I cant see my homes screen. It seems to take a long time to get through the second Samsung screen but eventually I can see my notification bar which I can still pull down and it I hit the home button twice it turns on S Voice so I know the screen is working. The screen brightness is up on full and when the screen is on its functioning fine. I can also turn it off without any problems
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Factory reset .
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hello my friend . this is the same problem that happened to me today in morning if some one help you pleas tell me what i have to do .
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Hello guys.
I am experiencing two strange situations on my galaxy s7 edge.
First, whenever I unlock it to the home screen both buttons ( back and multitask) keeps on flickering/flashing randomly. They just turn themselves on and off all the time.
The only thing I manage to do was disabling them (with an app) , so they woundn't turn on at all.
Second problem, I can't seem to put the automatic lock screen mode, meaning that if I don't press the lock button on the side, the screen just stays on no matter if it´s on the home screen or some open up app.
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The Screen works fine after booting the device. But:
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Rebooting or taking battery out and back in doesn't help most of the time to get the screen back - and after the first screen time out / turning off screen manually it stays black anyway.
So at the moment I can only use the phone at home with my laptop (with scrcpy ).
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I also noticed that the screen comes often back alive when i first start scrcpy with the --turn-screen-off flag and then push the home button 1 or more times on the phone)
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