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Zenfone 5 (ZE620KL) shutdown after startup

Star I
Model Name: ZE620KL Zenfone 5
Firmware Version: WW_16.0615.2004.126-0
Rooted or not: Not
Frequency of Occurrence: Every time phone is unplugged, using microphone.
I have installed yesterday the update WW_16.0615.2004.126-0. And today,(not yesterday and I have not rebooted since), my phone is shutting down without any reason by ~30seconds after startup. I have to put it on charge so it doesn't stop. The battery status is 100% and green led.
I tried a factory reset but it didn't work, still having the issue.
Edit : it's not 30 seconds after startup. It is every time an app uses the microphone. When it is charging, the microphone is just not working. But when I unplug the phone and I try to use the microphone, it shutdowns the phone.
How can I go back to previous version of firmware to see if it's a firmware issue or hardware ?