I don't live in Oslo, but I contacted Nokia Care by phone the first time the phone froze (end of November last year).
They recognized the problem immediately (the person I talked to had the same problem with his phone!). They were expecting a fix for this problem "soon". After reading different forums I expected this fix to be included in Portico. Quite a few people - world wide, have this problem. But no fix in Portico ...
I have flashed my phone two times myself. Nothing changed (but I guess I have no warranty anymore).
So now I wait ...