It isn't stuck, but rather you're hitting a point that other super-active players have hit (like Heyheuhei). You have almost 150 unexpired games, which is a lot!
The ladder algorithm tries to match you against other players somewhat evenly. That is, it doesn't want to give you 10 games against one player and 0 games against another - it tries to keep them somewhat in balance. Not perfectly balanced, but at least within a certain range.
What happens if you play too fast is you get lots of games against the other really active players, and eventually you get to a point where you've played them all, and the slower players you haven't played at all. The ladder might slow down your games in this case so that you get more variety.
As the slower players finish their games, you'll be matched with them. Then as you complete enough games against the slower players you'll start getting repeats against the faster ones again.
You can read about how the algorithm works exactly here:
http://wiki.warlight.net/index.php/How_Ladder_Games_are_Created
