Comment 2 for bug 1620032

OTA-12 krillin.
I also add:
when the phone auto switches off by cause of a battery drain, the button "ON" is inoperative.
I need to plug it to get it running and to switch it on. And then, I notice that it has a level of 29%.

So we are in front of 2 problems:

- why the phone auto switches off when there is still energy.
- why pressing on the button "ON" sometimes the phone does not react at all.