PlusNet do seem to be going through a bad time again at the moment. They are an ISP with peaks and troughs - at their peak they have been an excellent ISP but when they hit a trough they become dreadful.
Their customer service is in a right state at the moment but the network is mostly fine. There's the on-going single/multi threading download issue but I'm not convinced that's affecting vast numbers of customers and my experience of it is that it's easily cured and only hits me every couple of months.
That issue seems to be affecting a little bit more than just download speeds, I seem to find issue with certain services, these issue's I can only put down to some issue with Plusnet's links to outside networks (or with BT even!) or Plusnet QOS "type" system seems to be having a freak out!
I had full speed the other night (60Mbps both Single and Multithread) however streaming Now TV and various national radio stations on the Sonos system was impossible, this was also along side terrible variable browsing... funny enough hopping gateway then left me with slower speeds (20-30Mb/s) but I could stream both Now TV and Radio fine.... browsing was still slow but didn't vary by a few seconds and few minutes so much and was more 4-15 seconds.
Either way poor service all round, never have I suffered such "strange" issues and it also looks like the opinion from its customers I got a few months back when we first heard about support hour changes which was "Happy with Plusnet, but worry they won't be able to support us when something goes wrong" ....
Amazing how the futre was told by many customers huh!