My Lumia 640 will NOT shut off. Why not?

[Doctor_Who]

For some reason my Lumia 640 won't shut off anymore. On the weekends I like to shut it off. I don't need it to be on overnight, I'm not getting up early the next day for anything, etc. However, last night I tried 3 times to shut my Lumia 640 off. I pressed the power button, the message would then pop up saying that I'm to swipe down to shutoff my Lumia. I do so. The screen goes blank and black.

And then it reboots itself immediately afterwards.

Why does it do that?

When I want to turn it off, I want it off. I do not want it restarting. So why isn't it staying off, especially when it tells me it is shutting down?

 

[charlatan1978]

Hi, is the phone plugged into the charger when you are powering it off?
If so, then it is normal behaviour for the phone to restart.

 

[Gab A]

I have also seen the auto-rebooting post power off happen when the phone is unplugged if the dirty bit of the microSD card is enabled. If you use microSD card and see a warning message about the SD card potentially having an error after turning the phone on, try getting the card "fixed" on a computer using chkdsk /f X: where X is the drive where the SD card is inserted.

 

[Chintan Gohel]

or remove the battery, clean the contacts and firmly put it back in

 

[RumoredNow]

Are you holding the power button for a long time? Approximately 10 seconds holding the power switch starts soft reset which is reboot with cleared out system memory.