Wi Fi extender connection issues

I recently bought a NETGEAR EX6110 / AC1200 WiFi range extender because I had poor connection from my Sky router. I connected to the 2.44GHz frequency and all worked well for a week or so but then it disconnected overnight and will not reconnect. It does connect with the router direct and I have my iPad and iPhone connected to the extension with no problem. I moved the extender right next to the cam but it still says I have a problem with my WiFi (which I obviously have not!) Can anyone help please?