I had this happen to me too, post Portico. You could try resetting the phone but that didn't work for me. Reset it 3 times but no joy but try it anyway.
There is even talk about re-flashing the phone yourself but with the exception of the issue with the accelerometer, my phone worked. I didn't want to risk bricking it because somebody on this forum thought it a good solution. Me, I returned it to Nokia for replacement. It took all of about 3 weeks.