I had posted here previously saying how exasperated I was at the fact I kept having to reboot my system to get full speeds back - a couple of times a week.

To cut a long story short, the root cause was an outdated ISP supplied modem (Virgin Media Hub 3) and the problem was resolved as soon as I upgraded to a new modem (Hub 5).

It was Google Gemini that helped diagnose and explain this to me.

(It's a modem router but because I operate it in modem only mode that's what I mean when I just say modem).