Hi. I bought this range extender in November which has been working great until last week when it suddenly dropped the Internet. It is connected to my EE smart router and all lights on the extender are green (except the ethernet as no wires are connected). I have tried factory resetting it and reconnecting and its exactly the same. I had an online chat with TP link on Saturday and was told to check DHCP Subnet Mask and Default Gateway. I did what I was told and this made no difference. Any ideas please? I'm really struggling with no WiFi in half my property.

Thanks