Support Charging problems :/

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http://androidforums.com – Hi folks, I seem to be having issues with my Nexus 4 and charging. Two specifically. 1. It doesn't always start charging when I connect the mains charger, usually I have to disconnect and reconnect it. 2. When there is below a certain level of charge and I connect the charger within a minute it's jumped up to 100% and decided it's charged. It's not until I unplug it and it realises it has sod all charge that it warns me. Any ideas what could be causing these issues or how to solve? Thanks, Paul. (General)