Galaxy Tab A7 screen keeps locking

[poppelina35]

Hi I have a 2020 Galaxy Tab A7 and the screen keeps locking randomly. It can be instantly after unlocking the device or from a few seconds up to a few minutes after unlock. This happens whether I am touching the screen or not. It is not powering off, it's just locking the screen but makes the device unusable.

I've tried the following to resolve it but nothing has made any difference.

Removed case in case magnet affecting it.

Software is the most current version.

Screen time out function increased to max.

Opened in safe mode.

Soft reset.

Hard reset.

It's not worth paying for a repair but I would like to attempt a repair myself before replacing.

Any suggestions gratefully received.

[xSteveuk]

Hi,
Have a look at settings
Display
Screen time out

[poppelina35]

Thanks Steve, I tried that before posting. Increased it from 30 seconds to 30 minutes (there is no option to select never lock) it made no difference.

[antikythera]

It may be a sticky power button rather than the magnet sensor or a software issue. As you want to attempt your own fix try a toothbrush to clean any debris out from the button slots and see if that helps. I don't know how much you'd be able to realistically open the tablet to tear it down anyway because of the metal and glass without doing major damage to the screen. Yes there's a thin panel at the top but even so, it will be tricky getting the plastic tool in there to lever them apart

[Babelman]

I have the same a video will play,but can't  pause it,have to push power button  and swipe to open it and fine for a while, but goes again have tried loads, cache removal etc  help