Hi, Well after updating to 4.2 I have noticed that after using my phone from a full charge, I end up having around 70% remaining at the end of the day. However, the following day after being on standby the whole night, my phone is running very low, on maybe 6% or even going completely dead. Now previously a full charge would quite easily last me 2 full days before charging the phone! What is going on? The iphone 4 is only 6 months old!!