I've never had issues with this, but tonight I've been getting really bad network stutters. Average ping is normally always around 27ms, but I get spikes that go over 100 every 15-20 seconds at the moment in-game. Can't be the game servers seeing as I played with others on the same servers who didn't report any of the lagspikes.
Really sorry for your recent broadband issues. I suspect that things may have settled down since you posted as it appears that some work has taken place at the Headend local to you. Some faulty equipment has been replaced and my tests just now reveal nothing untoward.
Please post an update and if you do still require our help we'll be happy to look into this further