Device turns off alone topic

Device turns off alone

I do it yesterday
http://phandroid.com/2013/11/05/how-...t-the-nexus-5/
After it downloaded
After this I took with flsdhify
Install it openrecovery-twrp-2.8.3.0-hammerhead



He occasionally turns off me alone
And lights up after a few minutes
And it shows through usb like this

Why is it because I did root?
It is not to be before

Device turns off alone

How do I fix this problem?