@ARGamingPK1 the latest available to me is 1.3.1 build 20251023 47884, but this still has the problems. Multuiple decos and plenty iot devices kills 2.4ghz.

I have to run a beta that was issued maybe a year and a half ago. I know a LOT of pople on the forums are doing the same. I think it's a simple hack in that it just makes sure some decos use different 2.4ghz channels. This makes the 2.4ghz network much more stable, so the link is'nt dropping out every few minutes.

  @ARGamingPK1 Yes, and I suspect that is entirely why TP-link leave it as it is. It works well for reviews (if nothing else). However, use it in a real environment. The one mesh is designed for. Get 4/5 units, half a dozen 2.4ghz cameras |(I use TP-Link ones!). A bunch of IoT Wi-Fi plugs (mostly tplink, again), sensors etc (I have around 45 devices total), and you will find that 2.4Ghz stability deterioates massively. Ping times from 30-800ms. Then dropouts. And, it's like that all the time. Probably due to the large bandwidth, all units on 2.4ghz using the same channel, and likely a bit of interference from elsewhere (compounded as the channel width is so wide it uses 70% of the spectrum, meaning lots of  overlapping!)

So, yes - single DECO to router, clean air - Out of the box good.

Real use in an environment it is supposed to excel in.  Well, the reality is very different. Many people have shared posts here on the forum with the same exact story. Doorbells not working. Cameras dropping out. etc. It's all down to the 2.4ghz setup. I can fully appreciate TP-Link what the devices to review well, but, give us the flexibility to downgrade them to prefer stability over out-of-the-box review use, and many of us will thank TP-Link!

Thanks for sharing your data, though.

  @pjs_gsy and, fwiw, the BETA (fixed old firmware), built 100% to address this issue, for the most part, resolves it. So, they know the issue and they have a fix for it, yet that firmware is old and out of date. The fixes have not been put into the mainstream firmwares, and we are sacrificing stability, security, and new features, for 2.4ghz network stability.

  @pjs_gsy A quick example, in case anyone from TPLink is reviwing

Here are some pings across the network over the DECO. The 

The first one is actually over 2 decos! But, it uses the 5ghz and to the router. The second, is to a 2ghz camera, 1 deco away. You can see the iffy ping stability even there.
 

C:\Users\Paulhome>ping 192.168.2.239

Pinging 192.168.2.239 with 32 bytes of data:
Reply from 192.168.2.239: bytes=32 time=3ms TTL=64
Reply from 192.168.2.239: bytes=32 time=3ms TTL=64
Reply from 192.168.2.239: bytes=32 time=3ms TTL=64
Reply from 192.168.2.239: bytes=32 time=3ms TTL=64

Ping statistics for 192.168.2.239:
    Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),
Approximate round trip times in milli-seconds:
    Minimum = 3ms, Maximum = 3ms, Average = 3ms

C:\Users\Paulhome>ping 192.168.2.32

Pinging 192.168.2.32 with 32 bytes of data:
Reply from 192.168.2.32: bytes=32 time=140ms TTL=64
Reply from 192.168.2.32: bytes=32 time=34ms TTL=64
Reply from 192.168.2.32: bytes=32 time=522ms TTL=64
Reply from 192.168.2.32: bytes=32 time=163ms TTL=64

Ping statistics for 192.168.2.32:
    Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),
Approximate round trip times in milli-seconds:
    Minimum = 34ms, Maximum = 522ms, Average = 214ms