Wi-Fi disconnects automatically (Other user still can use it normally)

ZF Model: ZB602KL
RAM: 4G
Firmware/APP Version: WW_Phone-16.2017.1906.055-20190703
Frequency of Occurrence: 4-10 times a day or every time I tried to use the wifi
Rooted: No
APP Name:

Hi, After the update (ww-16.2017.1906.055) I noticed that my phone wifi keep disconnecting and I checked back to make sure, but the wifi I usually use sometimes was there, sometimes not. I'm not sure what happened, because I usually use the mobile data, but since I've used up all the quota on my mobile data, I tried using the wifi to keep online and this problem happened.
BTW,
My other family/friends that use the same wifi don't have this problem, also they're using different type of phone and it just me that has this problem.
P.S : I used the same wifi to download the update and before installing this update there was no issue with disconnecting from wifi.
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