Battlefield 1943 PS3 problem?

I bought battlefield 1943 vis the PSN store the day after it came out in Europe. It was a really goood game. I had reached rank 20 and all, but as the air superiorty became unlocked and available, i couldn’t join any game at all. a message pops up saying the game is unavailable and cannot join. At first, i thought that since more and more people are buying this game, i though that there wasn’t just enough servers so i waited for approx a week now..and i still can’t get online ! .. i tried going online in other games like…GTA IV..and that works perfectly fine. Is anyone else having the same problem ? Someone please help. that game was 13 euro’s !…Thanks everyone in advance