My network issue seems to have come back up again.

I use IRC quite a bit and months ago I had an issue where I would constantly disconnect from all the IRC networks that I use and also the IM networks like MSN, Google Talk and Facebook, I dont remember exactly what was done but it seemed to go away.

Now it has come back again and it is getting extremely annoying for me, I have swapped the main 3 ethernet cables in my network to other ones but the issue continues to happen and its driving me up the wall, also disconnected everything from my switch in my room and also the small 8 port one in the cabinet downstairs.

Does anyone have any thoughts on where I could go from here?