Lagging while playing

Hi all, ive been playing GW for about 6 months now and i love it. The problem is, i started getting horrible lags. They happen every 20 mins or so and last for like 1 min-2mins and its getting annoying. I cant do any alliance battles or Fort Aspenwood because i lag. When i do play in pvp, i usually have to put "lagging" because i dont want to be reported as a leecher. Im very good in pvp and its hard to put full potential in the game when i lag. Is there anything wrong with servers or is it just me? my computer cords are all right, check them every time, and i want it to be like regular. Please help