coffeebaron: If it slows down again, please login to the router and check what the DSL stats are doing (i.e. look for the page in the screenshot above). You could also request a 24hr analyser test through BigPipe to see if that picks up anything else.
Another thing to be aware of is any torrents, Spotify, online back-ups, iCloud photo uploads, etc etc can saturate your upstream, especially now you have 3x the upstream as before. Why does this matter? Saturating upstream will kill the downstream traffic due to TCP acknowledgement.
I did login to the router, and it showed the exact same stats as yours?... however, myself and my flatmate were not doing ANY heavy activity on the internet at the time. We both checked to see if windows was updating, our phones uploading ( which we don't do anyway ) torrents... the works. We were not doing anything download/upload wise at all.
It went from enjoying some CS:GO perfectly fine, and then BAM... 60 ping to 3000+ ping in about 5 seconds, and stayed that way for about 30-40 minutes. We couldn't load google.com or anything, we had to switch to Mobile data ( and no, we weren't uploading/downloading anything on our phones either )
Bigpipe have said they are going to monitor our line.
N