This Deco M5 unit is the last in a mesh of three such units (it is the furthest from the base station).

It has been working fine, but overnight has gone to constant yellow and then the light blinks red twice and then goes to constant yellow again.

I cannot connect to it.

I have tried resetting (hard and soft), and connecting it to the base station directly with ethernet cable and nothing will get it to see the other units or connext to any devices.

Any advice on how to add it back to the mesh without having to set up from scratch again?

Thanks