@peepoSad don't buy it. And better also not a TP-LINK

@mcanet That's sad. Apparently it's a hardware defect.

I was pretty satisfied with Archer C7 for so many years and now looking for something future proof for a new house. You cannot even buy a #$#$% expensive stuff nowadays that is JUST $#%#%# WORKING

@peepoSad I normal company will contact all customers and replace this devices for some that will work properly for a 300 euros devide. But TP-link really I found out that really they not care.

Too bad you can not set the firmware back to beta 1.0.8.
I have now manually set the frequency to 80 Hz and the channel to 44 in 5 GHz.
Seems to run a little more stable.
These settings went well with beta 1.0.8.

@broxtor 

had something similar with an asus router. unable to go backward with firmware.

eventually tech came out with a method. It was restore router to factory settings then via a combination of button presses  it cleared the memory.

Don't know if such a thing exists for this router. It was called an engineering reset.

So after 3 days of troubleshooting and headaches. I got the 5ghz working, then the printer wouldn't connect. Got both of those hooked up and working. Yeah, right?! Nah, ran a speed test on the 5g line, was only hitting 80mbs. Switched over to 2.4, was hitting 140. Then went back to my old router on 5g and was hitting 180+. They still have issues with 802.11ax, I tried it last year before I bought my current router. Thought the router was the majority of my other problem, but found out it is the internet provider in the area having connectivity issues. Long story short, this router still has issues when connected. Tried a new network adapter also, and on multiple different systems in the house. 

*Returned*

This morning when I turned on the router, the settings were all gone again.
Wifi password name all gone.
This is the third time.
This can not go on like this anymore.
Finally make software that works.
This hiring is a lot of work.
That is an impertinence !!!

@broxtor 

Hi All,

I`m running on attached settings. No issue from last two months. Try them. 

1.0.8 Build 20200318 rel.14152(4555)

Archer AX6000 v1.0

Regards

Dariusz

@Dariusz  According to newer software, it is not possible to go back to the old version.
I had the 1.0.8.

1.1.0 Build 20200427 rel.80857

I wonder where the dev team is coming from. Just to fulfill my software engineering curiosity