I was in a dominion match until my enemy's Tiandi join the fray when i am about to finish a valkyre and then my latency suddenly jump to 1400, this has never happened before, any idea?
Bad connection. The details can vary, the core problem is always this.
My connection is smooth though
It can be a problem on your provider's side too.
Weren't you complaining about your internet a few weeks ago? You have DSL don't you? A reciever of your house?