Did anyone find any solution for this? Also how many devices can AX10 support in 2.4g relaiblly? 

@sheminasalam 

Yes, I found a solution. I replaced with a Linksys. I fucked with this TP Link's setting for a year, and then, finally, out of warranty, bit the bullet and just bought a different router. I went with one of the cheaper WiFi 6 routers from Linksys and have been problem free since. My only complaint really is that's its a "smart" router and this auto assigns devices to its different bands. You can't manually choose. Even still, it's been a pretty good experience. 

Problem is annoying,

My old AC1500 Tenda was working great

200 mbps for my phones, 300 mbps for my laptops, all ok, no loss of data

I changed my routher with the Archer AX10 v1.0

i have 200 mbps for my phones(AC/AGN), 500 mbps for my laptops (AX)

But my applications on my phone have a laag that require several minutes to open. (FB, Lidl, Kaufland, Instagram, Whatsapp, etc)

If i change back to the old router, all is fast and well

I believe the advertising for Wi-Fi6 was a bit too early, as it is worse than BGN/AGN bands.

  @CalinRodean 

Same here. My Pixel 6 Pro is frequently showing 5/5 Mbps for send and receive transfer rates, whenever I'm far enough from the router for the phone to switch to 2.4Ghz Wifi.

Laptop (a 2021 DELL XPS) also reports the following when slightly more distant from the router (upstairs):

rx rate: 2.0 Mbit/s                                                                                  │
│tx rate: 5.5 Mbit/s
 

My previous Tenda AC8, which was only WiFi 5 AC1200, performed much better. Actually I still have it, connected it to my ISP's modem, and in the same spots of the house where the AX10 provides a few Mbps, with the Tenda I'm getting close or exceeding to 100Mbps. Speed test confirms this also, and in general latency seems much better as well (I can tap a video inside the yt app and it opens instantly, whereas on the AX10 I have to wait for a fraction of a second while the wheel spins).

I have a 1Gbps fiber connection, ISP isn't the problem. This router clearly has some issues with 2.4Ghz WiFi.

Unfortunately I'm outside the return window, and the Tenda has another issue which makes it not usable anymore.

I've ordered a Tp Link C80 which is a downgrade from the AX10 in many regards, but at least it advertises 600Mbps in 2.4Ghz, so I hope they paid special attention to that aspect on this model.

https://www.tp-link.com/uk/home-networking/wifi-router/archer-c80/v1/

  @Kevin_Z Hello, yes both are connected to the 2.4 band and the signal is weak cause it's upstairs.

The router seems to do a good job at picking the least congested channel, but still it's not able to provide satisfactory bandwidth. At this point I suppose it's just a limit of its antennas, and I'm going to sell it.

Firmware is up to date.

For the record, I received the TPLink C80 and set it up yesterday, and the bandwidth it provides in the same spots of my house is considerably better (tx/rx rates are always above 50Mbps, VS 5 on the AX10). Speed tests also confirmed that this bandwidth is real and usable. Unfortunately it's not a WiFi6 router, but for sure those bigger antennas perform considerably better.