Recently I bought some Archer C20 routers, one to use it as an access point and the other ones are used as range extenders (because I need to connect by wire some networks devices that needs to enter a network and ONLY can support cable connection, i'm using it a a WiFi Bridge).
When I connect the first connection, works fine, sometimes two or three of them works fine, but after a power failure, every router can't reestablish the WiFi Connection. Everything happens in 2.4 GHz and 5 GHz connections (the link is dual). I've tried another router from another vendor, and has the same issue, and a lot of inestability.
The site that have all this intallation has a very saturated 2.4 GHz band, so is a better choice to use 5 GHz. In both cases, codification for WiFi pass is WPA2. All the IPs needed in this project are fixed. And is still very unstable.
All advice for this project will be greatly appreciated. TIA.