Frequency: Fewer with higher Rom version. About once per day for 4.3.
The problem frequently happens when I just take the phone outside my house/office, and seldom happens when the phone just stays somewhere.
The problem seems to be irrelevant to the remaining battery capacity or the uptime, but it never happens when charging.
The problem seems to be irrelevant to the Apps installed.
The problem seldom happens in the first 3-4 days after flashing a Rom, but happens more and more frequently as time goes by. My guess is some cache is stuffed by some trash, which causes the problem. The phone may be fine as long as the trash can be cleaned up on a regular basis.
I manually reboot my phone at most every two days.
Solutions tried, but don’t work
Flashing official ROMs 4.0.4, 4.1.1, 4.1.2, 4.2.2 and 4.3 following the procedure “adb reboot bootloader; fastboot oem unlock; flash-all; fastboot oem lock”, without google wallet, not rooted.
Turning off the auto-brightness control, as suggested by some post on the Internet.