Guild Wars 2

I have done the achievement already, did it during the first two days of the event. Back then the puzzle seemed to work alright but now I can’t beat it for the following reasons:
1. Almost every time I jump on the snowflakes a random wind teleports me back to start.
2. If I get to snowball part I get run over by fantom snowballs, I suddenly get damage and get teleported back to the spawn even if there’s no snowball anywhyre nearby.

I’ve tried it with 2 different DSL internet connections (100Mbps VDSL on my apartment and 10Mbps ADSL2 on my parents place) and the problem persists.

Anyone else having the same problem?

Here is a video I took of the problem:
http://www.youtube.com/watch?v=RYai1ATUHQ8

Sounds a lot like lag to me.