@Sunny23 

Hello Before support answer just wanted to add i tried the XE75 pro ( 3 pack) for a week or so and ended up going back to my Deco M9 3 pack on my gigabit 900/900 connection. 

I would make sure you are using the wifi 6 backhaul feature ( improved stability at the cost of some speed )  and keep the other things enabled fast roaming, beamforming etc. Also if you are connected to the nodes satellites wireless then make sure you see a strong signal in the app. 

Also the wifi 6 can use 160htz so make sure that has not downgraded to 80htz due to a radar strike. Firmware updates are very slow on TP link  ( Not forum supports fault ) The fastest i saw on the wireless was about 650mb on a AX200 wifi 6 laptop card and about the same on the iphone pro 13  max. 

Changing the DNS on deco system to 8.8.8.8 and secondary 1.1.1.1 improved general page loading and responsiveness and generally quicker than the default BT ones. 

The reason i returned was i found the system not much of an upgrade from the Deco M9s ( price value point of view ) and felt the XE75 pro needed a good few firmware updates to improve things which i did not want to wait for.  ( flakey as i would describe ) 

Just for reference we have a 20-25 devices online at home, 3 storey property with the wireless nodes reporting Strong connection. 

  @IntrovertSins thanks for the reply.

I've confirmed that the deco's are configured to use the 6GHz band only for backhaul and the signal strength is showing as strong in all locations.

unfortunately there's no visual indication of whether the 6GHz band is being used. The stability issues occur when connected to the main deco as well so the backhaul should not be in use in this case.

I've tried all variations of beamforming / fast roaming on / off with no luck and also confirmed the 160Mhz channel width is in use.

I'm using cloudflare (1.1.1.1) for DNS which I find to be very responsive normally.

Like you I've reached the conclusion that these units are  flaky and are overdue a firmware update.

That's not unexpected with new hardware, but the issue I have is it seems tp-link are simply not interested in addressing this. I've seen several other experiences similar to ours reported so I suspect this is a common occurrence.

  @Sunny23 

I believe there is an update to the XE75 coming soon and afterwards the pro version. 

When using the 6htz backhaul options devices still using Wi-fi 6 as when checking  in windows on the laptop (Wifi connection properties)  it listed the connection as Wifi 6 with the much faster link speed than Wi-Fi 5. But i reckon the XE75 pro is not polished enough and knowing how long TP link are i was not prepared to wait. Coverage was pretty much spot on though but about the same as the Deco M9 ( both systems are triband ) 

Im currently looking at any deals for the Asus XT9 ( its not wifi 6E ) but to be honest 6E very few devices support it currently. ( Wifi 7 around the corner ) 

  @IntrovertSins hopefully there will be an update soon.

I don't have any Wi-Fi 6E devices at home, but I can see my other devices connecting at WI-FI 6 with much faster link speeds than Wi-Fi 5. Just a shame about the stability.

I've heard good things about the ASUS mesh systems. So maybe one to consider should this not get resolved. I think in future I'll focus on systems that expose more diagnostics and settings to the user.

  @Sunny23 

TP Link deco are generally aimed at mass market non techy users hence the limited tweaks and settings.
 

My M9 Decos have worked for the last few years without any real issues so thought the XE75 Pro would be good upgrade for my Gigabit . But found the lack of features in a high end product and stability not for me . 
 

Have used ASUS in the past ( AC66U and AC68U)  so looking at that brand now again. 
 

Good luck if you stick with the XE75 I'm sure the next few firmwares will fix things. 

  @Sunny23 

Exactly the same problem, I have a DECO XE75 PRO, the WIFI network is unstable all the time, drops in speed, I check right next to the DECO unit, the speed is received on the iPhone 14 pro max 500 MB/s
A laptop test shows a connection of 2.5 GB, but a speed test receives 430 MB/s. My connection at home is a 1 GB fiber connection. A test with a direct network cable to DECO receives 980 MB/s.
I am very disappointed with this device
For the test I did, I took a router connector from a Chinese company AX6000 and to my surprise I received 870 MB/s on my iPhone. I couldn't believe that a device that costs $100 gives dust to a device that costs a lot of money. I feel disappointed

  @Avrahm thanks for the feedback.  Yes I'm also disappointed. Given how mainstream the devices I'm using are I'm not surprised there are others seeing similar issues.

  @IntrovertSins 

Hi there

Can I ask when you doa  wired speed test on your M9 what speed you get.

I have 900/900 and only seems to get around 500.

Thanks

Lee 

  @happychappy 

Hello 

Just did a speed test on my Current Deco M9 plus , Hard wired into main deco plugged into ISP router. 

Speedtest by Ookla - The Global Broadband Speed Test

Maxes out my download 929mbs but upload little slower but still very fast. I have my Deco in Access point mode as the ISP device is the router. The XE75 pro maxed the connection fully on Ethernet in similar setup but shame the firmware was poor so returned, The internal app speed test on the Deco M9 is bugged and never goes over 500mbs. 

Hoping things improve on that front and would happy to pick up another 3 pack , been told the 2 pack Asus would not work well as i have a 3 Storey property with thick concrete walls and cabling things not an easy option. 

So currently using the Deco m9 for little while , fastest wifi is about 450mbs so not using my full line speed but im paying cheap for my 900mbs line so don't mind at the moment 

  @IntrovertSins 

A quick update on my progress.

I tried a few different steps to try and isolate the issue I was seeing with the Intel x201 Wi-Fi adapters after upgrading all drivers and experimenting with driver settings. Unfortunately the stability was still not up to the standard I would expect.  Indeed the only way to get acceptable performance in my case was to use wired Ethernet on the laptops. 
 

Given that no firmware update has yet materialized I reluctantly concluded to return the units and received a refund.

I purchased 3 x ASUS XT9 units to replace the xe75 pro units , placed them in the exact same locations and the stability is perfect.  I'm also impressed with the full featured web ui and App, and may also install the Merlin firmware once available for the Xt9 further customization. 
 

So while I've paid a bit more vs the xe75 pro because of  the extra unit for me it's well worth the money.