My Character was killed. Now i can play again. I really think it had something to do with the Protector Cases.
My Character was resetted. Friend grabbed all my stuff and gave it back to me. At this point the problems started with the massive no sync. Now that i lost all of my old stuff it is working again.

Hardcore is working! Problem only with my Regular Character!
Maybe its a bug because i have 6 Protector Cases within each other? I heard that could cause some problems?