I think it's depend on area.
Like mine area Puchong landed house, currently using fiber 300mbps plan
Previously upgrade from maxis ADSL become 10mbps --> 100 mbps --> to currently 300mbps
so far happen few times server down ( like whole puchong kena within a day or 2 fix )

Yes, please change the original maxis provided router to better one
Since my wife keep on complain mobile legend keep on disconnecting or unstable example suddenly high ping that after like 5~10 sec go back normal
but hero die already lol
So after like few months research that online check, talk to maxis technician few times on different person, TP-link router is SUCKS!

End up im using ASUS RT-AC86U router ( china version ) lol
You may refer below link if u decided to change
China version actually no different with local one in term of router, only issue is on warranty part
china version need to send back to seller that takes time maybe longer than you send back local manufacturer for warranty
but price different around 200+ so u can decide by urself
https://shopee.com.my/product/53714761/1359873119

This is the additional fan for cooling router as after research some people comment that after few hours will get hot, thats not a good thing so just add on another RM31
https://shopee.com.my/product/147376949/2338458207

after changed my router, speed stable, as fast as the speed show like speed net cause before that tp-link even i check speed net for my internet it can goes up to 4xx mbps but due to lousy router you will feel unstable network when u go on gaming and so on internet stuff

hope this can help u guys