I'm having this happen on my desktop computer just yesterday (I'm assuming after a Windows 10 update).
It's all going along fine and then my computer disconnects from the internet and won't connect to the wi-fi again.
I have to go and switch the router on and off for it to find it again.
at the beginning I note you only use wifi at home. Have you tried wifi through hot spot on your mobile? Or go to Bunnings car park and try it from there for free.
just suggesting a way to eliminate any obscure modem or network fault.If it works on other WIFI access methods it may not be your PC . Have you compared your PC network connections properties to another PC?
My HP G6 laptop in the properties has everything ticked except microsoft network adapter multiplexor protocol which is unticked. I dont recall ever changing anything here.