bro was ur problem resolved? since i am also facing same problem since i updated it with windows 8.1.
i have tried each and every method to tackle this issue but nothing seems to coming in my way..if you have any idea what to do..then plz let me also know ....i have lumia 520
No luck so far . tried most of the options suggested here and found in internet but still no joy . I have updated the phone today as well ( MS released another update) , still no luck.
I will keep trying to find out the solution , will let you know if I can fix it. Do the same help for me if you find any solution