I have a 20mb cable/fibre optic connection (Virgin). It's been perfect for the best part of 2 years - pings of 20 solid to UK servers, 30-40 to french, german and dutch servers and 50-60 to polish etc. Just recently (the last month) my ping has been higher and more unstable than usual and I've had lots of complaints about me warping. For example 40-70 on UK servers and 50-110 on euro servers with warping and ping spikes on all.
Any suggestions as to sorting this out? Thanks