Lenovo z90a40 zoom Bug with Wi-Fi

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.

I made logcat of this error when turning on wi-fi on the phone and then turning off wi-fi on my router:
My phone was connected to PC by adb. When the phone was turning off (as result of bug) it was recognized as Qualcomm HS-USB Diagnostics and Qualcomm MMC Storage USB Device.