e2303 sleep (screen off) reboot

I have two of these (e2303), couple of months old and both have had the same problem, since unboxing. When the phone is sleeping it will reboot itself after 30 minutes, hour, two or more (and you won't hear that startup sound, as with normal reboot, just the boot animation). When the WIFI is turned on, reboots are more frequent, and with mobile data only (WIFI off), reboots are less frequent, anyhow the phone doesn't reach more than 30 hours uptime ever. The phone will never reboot while it is being used, screen on, it happens only when the screen is off. This all looks similar to the Nexus 4 sleep of death problem, however e2303 does not get frozen in sleep, it will just reboot instead.

Running latest firmware for e2303, .111.

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