After latest update 8.1 preview for developers, it seems that my lumia 620 charging at a slower rate. I'm using the original charger from nokia. Before the update my phone would be fully charged for 2 hours at most. But now, it takes more than 2 hours. I'm not sure whether the charger or the phone update itself causing this problem. Anyone having this issue after the latest update 8.1 preview for developers?

