I have recently had my problem with unstable broadband connection which was an external problem fixed by Openreach.
I now have a problem with intermittent wireless connection. Sometimes for minutes other times for a couple of hours. It will then be fine for days. I have two available connections on my router 2.4Ghz & 5Ghz. In these circumstances neither work and I have to use hotspot with my phone or an ethernet connection.
I have carried out all the usual checks and restarted the router and powere it off. Still unstable. Any ideas?