It's spiked Lag. Everything will be fine then there will be a spike. I ususally run 150/160 ms and when it spikes it goes to 12,000 for a half a minute, then levels off around 3000/ms. Stays there for a minute or two and goes back to 150/ 160.
It's a never ending reset effect and when it happens you are pretty much screwed. You can't play.