Netgear wifi range extender n600 wn2500rp

So I bought a wifi extender (n600) and I setup up and it was working fine for a couple of days but all of a sudden it stopped working. It shows that the wifi is on on the extender but when I try to connect my phone or PS4 to it or any other device it says no connection. I already reset it and did the setup all over again but it's not working . Please help