go to http://www.pingtest.net and see if you have any packet loss, run the test a few times from a few different servers, if you get a load of packet loss, or high ping (over 50ms) or high jitter consistently or intermittently then it could be your connection playing up. do the same at http://www.speedtest.net to make sure you getting decent speeds(above 3mb is ok, depends on your normal speeds) Also make sure if you’re on a wireless network that it is passworded, could be the neighbour’s son using your connection to look at goat porn.
If your connection is faulty, restart the router/modemand try again, if it consistently plays up, contact your isp. If it’s not your connection then it could be a whole host of things, I can talk you through a few things on TS later on between the rugby matches