I think all the networks have been struggling after imposing blockages to torrent sites by a new court ruling. It seems to be affecting lots of servers as the traffic is routed here there and everywhere, so if they block an IP address for one thing, it can suddenly affect lots of other services, as they seem to have no idea where stuff is really routed these days.
Mine was bad, but just about still worked for last couple of days. Has improved today, and already found a workaround to access my favourite torrent site, using vpns, so has not worked for them anyway, and others will do the same. If they try and block that sort of thing, then banking services etc will also be screwed, it would seem.
All providers are being affected, to some degree by these issues. It was in the news.
Neil