I received my iPhone 7 today, and the battery drain over the course of the day was quite normal. At around 25%, I plugged it in to charge (using the same charging cables that I used for my iPhone 6, which are all officially licensed lightning cables), and it has since been draining further despite being plugged in. Went down to about 9%. Did a hard reset, it started to charge up again, but has since been draining while charging. It hasn't been under any special load while charging, so I'm not sure what to make of this. Has anybody else been experiencing this problem? Thanks!