Affected version: MK71.2-zoom-180704-RELEASE.
Affected Device: Z90_zoom. [VIBE Shot]
Not possible to get error log or screen shot for the this bug.
When the WiFi connection is very weak or far, always the the screen goes black for seconds then the device force shut down automatically with long vibration, and to turn the device on again I have to press the power button for 10 seconds. When this problem happens for several times the system crashes and the device stuck in boot loop, so i have to restore the factory set, or flashing Mokee rom again.