@Solla-topee 

Thanks for your reply.

I don't need whole house WiFi just in my conservatory.

This worked with the TalkTalk router but not with the Vodafone.

As the signal is much lower from the Vodafone routre I have used a second extender between the two.

The signal strength is in the 90s (out of 100) in my conservatory.

It is not the strength that is the issue it is the discontinuity of the WiFi service andf the need to manaully disconncet then reconncet which I never had to do with the initial one extender system.

One button activation used to work. It appears that having to set up useing an overcomplicated app is the problem.

How do I know that both extenders are using the same network?

How do I know that both extenders are using the same password?

This infromation was never required to be setup with the intial extender.

Why do I need to disconnect and reconnect of both extenders are using the same WiFi signal?

Why don't two extenders provide a continuity of service?

I regret I am unable to move my router due to it being hard wired to my fibre box! This situation is what extenders were created for!

If the router could be moved to the position to strengthen the signal at a required point there would be no requirement for having/requiring extenders in the first place?

It appears the extenders are swapping the channels about in an apparently random fashion and for no reason that I can see.

With the blue light on the signal strength is high but the channel changes on the extender then the light changes to red and the signal drops on the mobile devices.

I thought, being extenders, they would stick with the original signal/channel from the router then boost that signal.

If I fix the router to say channel 100 only, the extenders are repeating on channels 3 and 6. I think this random channel hopping is the problem.

Both extenders are using different channels to the router. I believe they are getting muddled by the fact that two extenders are both independently switching channels and they are constantly trying to catch up with each other.

If I move from the room with the router on channel 100 with a strong signal, then go into a room with a strong signal on a different channel, the device needs to be resynced with the new channel. Its the resyncing that is the problem.

If I place both extenders adjacent to the router I get channel signals jumping about like crazy and yet the signal strength is 100%.

So how do I set the extenders to just boost the signal they receive by remaining on the same channel as the source and never changing when the received signal is strong, or for that matter, when it is weak (which it won't be when they synchronise).

@AnnieBody 

As a follow up...

If I turn off both extenders the signal in my conservatory drops to 15%, but, and this is the crux, I never have to resync any of my devices. NEVER!

This is how WiFi should be.

It would appear that extenders are either not working due to the setup, software bugs or not being fit for purpose.

@AnnieBody 

As a second follow up, which appear will never be responded to:

I turn of both extenders.

Turn on #1 then reset and carry out setup again.

I now have two wifi signals: router + router_ext.

I can (and have to) manually switch between the two when moving around.

Router signal reduces as I move away from the router and as router_ext increases.

Reset #1 and carry out setup again.

This time I name the extender the same as my router: router + router.

This implies I have the same Wifi signal covering a larger area.

Router signal reduces as I move away from the router awith no increase as I approach the extender.

As no one from TP-Link appears to give a toss about resolving this issue, I have to assume the extenders are not frt for purpose as wifi extenders.

I shall now look for an alternative tfroma manufacturuer t hat knows how to exnetnd wifi effectively.

@AnnieBody 

It would appear that despite the claims of TP-LInk I cannot do what they have previously advised I could.

As confirmed by TP-LInk technical support:

1. The RE450 extender is just that. You can only use one extender connected to a router with the same SSID. You cannot use a second to increase the

a range of the first extender using the same SSID.

2. The extenders should have individual SSIDs or else they interfere with the router signal strength and with each other.

3. In order to keep the devices on the one SSID you would needa ONeMesh compatible router and OneMesh compatible extenders.

4. There are currently no TP-LInk devices that will do this with Vodafone Gigafast pure fibre compatibilty. So the devises are only backward technology compatible.

5. TP-Link have suggested devices will be updated, but this mainly appears to be for USA purcahses. There are no equivalent UK updates forseeable.

6. Instead of waiting for TP-Link to play catch up, both Netgear and Asus offer systems (there may be more) with OneMesh equivalent system compatible devices.