NETGEAR N300 Extender suddenly won't connect to router

Hi, recently my extender has been struggling to connect to our home router. I've tried all the work around I can fathom, power cycling the extender, factory reset etc, absolutely nothing.
It has been absolutely fine the previous week, and can connect to my mobile phone's hot-spot without issue. Its only my home router. Any ideas? I even used my hot-spot to try and see if it simply needed a firmware update, no dice. Very frustrating!

I'm unable to move the extender to another location as my PC is connected to it via ethernet (my pc has a bad WiFi antenna/adapter, so no wireless for me), however even when scanning for my WiFi the router is always between 96-100% strength.

Extender is n300, hardware EX2700, firmware V1.0.1.56. Was bought September 2020. If it makes any difference also, I am located in the UK.
I don't know the exact specs of my router, but I have included a screenshot of the information that comes up through its management app. Any help would be appreciated!