I know there been a while, but I just need to tell you this
I tried a restore and it didn´t work out. The same problem just continued and i started using and old phone instead. A couple of days ago I read something about ios6, and I thought: Why not try it on my iPhone that I don´t use? I installed ios6 and since then the phone have worked perfectly, except for one single hangup but then it was just to restart it. Ios6 beta 2 is actully really stable. I mean, now at least it´s a fully functional phone.