Lenovo z90a40 zoom Bug with Wi-Fi

Lenovo z90a40 zoom Bug with Wi-Fi
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#1

Bug description: long vibration after wi-fi is turned on (often in standby mode) and then the phone not responding at all. Long press the power button helps only. Bug may appear or not randomly.
Affected version: MK71.2-zoom-181020-RELEASE
Steps to replicate: turn on wi-fi and wait a few moments or longer.