@DZee 

Try modifying the wireless channel and width for both bands. For the 2.4Ghz set the width to 40 MHz, and 80 MHz for the 5GHz. With respect to channel try different combinations. 

@Tony I'm facing the same issue, after this "upgrade" not only wifi but also wired (fiber) connection loses ~ 40% speed (the solution presented did not work)

@DZee . Since I managed to get firnware back, I don't find firnware anywhere.

FHBS wrote

@Tony I'm facing the same issue, after this "upgrade" not only wifi but also wired (fiber) connection loses ~ 40% speed (the solution presented did not work)

@FHBS 

What speeds do you get while connected to the modem vs the router?

Within the TP-Link router have you tried disabling NAT Boost (Advanced > System Parameters > NAT Boost).

@Tony 

Hi just curious if there was any more info on this problem?

I have the same issue , with an A6.

1.13 works fine but 1.15 firmware caused me the same issue . Mainly noticed in online gaming . 

Ping would spike way yo every 10 seconds or so , making games hang constantly and is unplayable. 

I downgraded to 1.13 and problem solved. 

I did try adjusting the band width and turning off NAT boost as per earlier instructions and it did not help. 

somebody please help me, i just bought this router (in south east asia) I don't know if it is version US or EU. I have problem with the 5Ghz wifi speed it really slow, only 173mbps, after spending time browsing on the internet i just realized that firmware is the problem, I'm using version 1.1.5 Build 20191112 rel.36515(5553). So.. did you guys solve this problem by downgrading the firmware? how did you downgrade this firmware? any guide?

edit : my router is ver US, sorry guys, i didn't notice it

@Elmachine can u please tell me from where did u get the firmware and how did you did the firmware downgrade 

@DZee 

Model: Archer A6

Hardware Version: Archer A6 v2.0

Firmware version: 1.1.5 Build 20191112 rel.36515(5553)

Hello i have just bought the archer a6 1200 and my speed on 2.4Ghz is same as 5Ghz. I have tried changing channels and chanel width but the problem still continues. Also when i am playing online games like fortnite my ping keeps spiking and the game is unplayable. Can someone help me out please ?

@DZee 

i am working via email on this same  sort of issue with the 1.1.5 firmware. some devices are no problem, some devices drop packets and ping into the thousands. I ended up running a cat5 wire to my main computer because i couldnt work. i ended up downgrading the firmware and it fixed it but recently upgraded again hoping maybe there had been a fix applied and new firmware released but im back to square 1. i am hoping this can get fixed at some point. did any of you guys find a way to fix the issue other than rolling back firmware? also any idea why some devices have issues but others dont? 

@DZee 

Thank you for ur solution. I am also facing same issue . Let me try this

Ever 10 seconds data comes and stops for 3  seconds. Unable to use for Online classes and meetings