BB Curve 8310 crash while calling

Hello everybody,

You are my last hope. I already searched the internet and tried a few things but nothing worked.

My Problem: I dial a number and if someone picks up my phone crashs. Not every time and sometime I can phone a minute and then it crash, but it never crashes while working with the phone, just on calls.

This problem started when i updated the device software from 3.7... (don't know exactly) to 4.5.0.55

I tried to update the phone to 4.5.0.69 and also downgraded to 4.2.2.146. Before istalling new OSs i wiped my phone with JL_Cmder the latest version downloaded yesterday.
I am using the latest DM version 4.7 on a WinXp Pro System.

The phone is originally from Vodafone Germany but now i am using a chinese sim card (i am in china at the moment).

But the problem was the same with my O2 sim card from Germany i am using in Germany.

I hope i dind't forget any important information. But if u need further info just ask.

I hope someone can help me out.

Best Regards,
Steve