@Omochao I have just had a livechat with Deco tech support. They told me that AP is correct for my setup. There are a few questions in my mind but I am very happy to be working again. Thanks again.

@Omochao when I was first getting backhaul set up, I was told by Deco support that it would not work in access point mode. I have been using router mode since then. I just thought that I would try ap...

@Omochao many thanks for your persistence. My switches are not upgradable but I recently upgrade the Decos to the latest firmware. I have been away on and off in January so I didn't notice it...

@David-TP My main switch is a TL-SG1016D, and the other is a TL-SG105(UN). I have had Backhaul running for months which is something of a mystery.

@Omochao i dug out another switch and put the two Decos side by side, connecting through the switch. It is now working properly. Now I need to work out where the faulty bit is. Living very close to...

@Omochao I have isolated the cables to one switch but the problem persists. Connected directly is fine. Given that my switch setup is unchanged, I think that I need to start testing the cables.