finally
after giving my mobile to repair on january 20 i now sit at home with a replacement unit in my hands.
After numerous phonecalls and hunting nokia to get my mobile repaired.
I wont include all the details, but i asked nokia if they think this mobile is fixed now so the usb should be more sturdy.
I got a little vague responce that if there is a service bulletin about something like this usually its also getting fixed in production. But i could hear from the tone the guy has no idea if my phone is improved or not.
Now when i sit with the phone i have to go trough a lot of software updates. it has the old software from last year on it that wont work with my 3 sim card....
That should be enough to know this phone does not have an improved usb socket, its same date on this one as the one i had before, which lasted for about 3 weeks use...

/Andreas