Guild Wars 2

I have reinstalled the game twice now and it still has the same problem. The game window minimizes and as soon as I bring it back up it minimizes again. It will do this a lot then stay open for about three minutes and start all over again. This issue started last week, 12/22/14.

I have played Snowball mayhem 6 times and have not received any Wintersday Gifts or chests is anyone else having this problem?