@David-TP 

Yes, all Decos connect wirelessly. I cannot use Ethernet Backhaul to the outdoor Deco (who can?). I tried utilising Powerline devices but they kept dropping in and out and causing their own issues when doing so. This appeared to be something that could not be corrected as the post on the forum just went quiet, so I removed them (TL-PA7017P KIT).

Okay, I am currently testing the Connection Preferences you recommended. One thing of notice that on the last 2 days the X50-Outdoor now reports a Weak signal whereas prior to all the problems it reported a Medium signal. Neither the X50-Outdoor, nor the Living Room X60 has moved from when it reported Medium.

(I bought the X60 to replace the X55 in the Living Room as it had the better antenna array, on swapping out, the X60 gave me a Medium signal so I was happy, now I am back to the Weak signal I had with the X55 so no point in having the X60!)

As for the X60 Firmware, just to double check please:

I have X60 V3.2 currently running V1.2.9 build 20240722

you have suggested utilising Firmware for a X60 V3 V1.2.8 build 20240723?

I ask for clarification as it appears to be Firmware for a device version I do not have and a firmware version older than the one I am currently on?

I don't want to break anything by going against the usual advice from TP-Link to not install firmware on a device that the firmware is not built for.

I am hoping not to have to spend even more money on my wireless network than I have already. In my cupboard I already have 3 x Deco E4R, 3 x M5 and three sets of Powerline adapters I cannot use, I'd rather not have to add more to it!

Thanks

  @David-TP 

Okay, I updated the Firmware, but overnight the app seemed to counteract that update and re-installed the 1.2.9 Firmware that was on there before.

I've reinstalled the 1.2.8 and turned off Auto Update.

The low signal from the Outdoor Deco remains. 

This is all getting very messy again. Nothing works properly. I'm spending a massive amount of time messing around with firmware on products I've paid good money for.

I'm going to give TP-Link 2 weeks before I take this whole thing to a Small Claims Court to get all the money back on all the Deco and TP-Link stuff I've bought to try to get this system functioning. I believe this is enough time, I am tired of waiting for decent firmware and for wifi I can rely on. I am not a Beta tester and I don't enjoy being treated like one.

@David-TP 

Oh, and despite using the "Connection Preference setting to connect the Living Room to the Music Room Deco, it fails to do so and constntly connects to Office

As does setting the Garden to Connect to the Living Room, which always connects to Music Room.

What is the point of a Connection Preference setting if the app ignores it. (Asked before but I never got an answer).