My fibre goes really slow for an hour or so then returns to normal
I've been having intermittent faults with my fibre broadband for a few weeks now. Recently getting worse. I've been running smokeping on my PC to see if it will help identify where the problem is and today lunchtime everything went really slow for over an hour. Similarly yesterday evening. I ping the google DNS server at 126.96.36.199 at 30 second intervals, results are plotted on the graph attached. I similarly ping the router every 30 seconds and no such issue is showing, so I suspect it is not internal wiring. Anybody any ideas where I can find this problem.