Standby problem. (black screen)

[Yvi]

Hope to find some help with my latest problem (after update to 4.2)
After the update i can't lock my screen anymore.  When i lock, the screen goes out for a second, and then pops up again. It drains my battery. 
The screen pops on and off every 1/2 to 1 minutes.
My settings are oké. They set to 2 min before he goes to sleep, but my device doesn't sleep, it stays awake! Who can help me with this big problem?
My N7 is NOT rooted.

[bjs229]

When you say lock, you mean press the power button or use a magnet?

[Yvi]

I push the power button the same way that I did before, but the screen pops up immediately after I push the button.
How can I use a magnet? Maybe that is a solution.....

[bjs229]

Is there a cover on your nexus?

[Yvi]

I found out how to use a magnet. I taped it in my bookcover and it works!
But my tablet still try to pop up ones in a wile you see the screen flash and disappears again.
This is a solution for now, but not for long. I hope to solve the problem with the software.
Any suggestions?

[JayJ]

I've not heard of anybody with this problem since the 4.2 update so I would hazard a guess that it's an application clashing with the update, you could try removing some applications until it locks or do a factory data reset but this will completely wipe your device.

[bjs229]

Glad the magnet gave you a temporary fix but I would take JJz advice.

[Yvi]

If i do a complete data recovery, does it wipe also my saved files? Do i have to backup all my own files?
And do you think it is the software or maybe my nexus is broke?

[bjs229]

Yes it wipes your files. I am not sure as far as hardware or software. Can't hurt to try and reset thhe device before you take it back to the store just for your own knowledge and ours.

[Yvi]

I indeed think the best option is to reset my N7. It takes me some time to backup my files and apps, but when i done, i come back to you and let you know if my problem is solve.  Can take a few days.  Thank you so far.

[Yvi]

Thank god my problem is solved! I did restore my N7 to the fabric settings.
Now I have Android 4.2 whitout that nasty bug.
I'm happy again. :-)

[bjs229]

Good News Yvi. Glad you got going. This thread will help people.

Sent from my Nexus 7 using Tapatalk HD

[Yvi]

I found out after i put all my apps back, that still one of the apps Wakes my N7. I dont know which app it is.
I resetted my N7 again, and now i put a few apps every day and hope tot find out which app causes the problem.
When i find out which app did this, i Will post it here.

[bjs229]

Are you getting any notifications from apps?

[bryn]

I found out after i put all my apps back, that still one of the apps Wakes my N7. I dont know which app it is.
When i find out which app did this, i Will post it here.

Found today that a news collecting app woke my machine up in the night and tried to flatten the battery by morning
--
Bryn