Game with Lag showing 120 ms or 240 ms

Good afternoon (in Brazil time * laughs *) last night (time in Brazil) at 23:00 or so my game started to press with the ping sensation with 2000 ms and I tried to relog several times and he showed me the ping as 120 ms or 220 ms but with a lag of more than 2000 ms and now I tried to log in and still has the same problem.
note: yesterday I tested both on the icecrown server and on lorderon and now just on lorderon (I don't have the premium * laughs *) and my internet outside of wow is perfectly normal. I play with the cable on the pc.