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Signal not stable

Star I
ZF Model: ZB631KL
Firmware/APP Version: 16.2017.1905.065-20190507
Frequency of Occurrence: Always
Rooted: No
APP Name:

Greetings. I recently bought new Zenfone Max Pro M2. And then I play some online games (ex. Mobile Legends), here i found that the network is not stable (ping latency suddenly goes high in some interval time). Then i use another phone to check if the problem lies at my sim card, but there is no problem, it work just fine. Then i change to another sim card, the problem still persists. Then i checked at a web based speed testing service, here i found the ping latency at some interval goes high to 300ms, even to 1000ms. I am also checked at the safe mode, but latency stays same. What is the problem, and is there any solution to this matter. Sorry for my bad languange, and thank you very much for the help. Here i upload some ss from speed testing service web.