Make sure plugging the micro USB into the charging port isn't wonky, and makes a good connection every time. On mine, the cable needs to be wiggled into a "just so" position before a charge begins, and sometimes, even though charging, the phone will lose power rather than gaining, even when turned off. (I have no idea what it's doing, but it loses more battery power "charging" than it would just being off and doing nothing.) Other times, once wiggled into place, it charges normally. The phone had never been handled roughly, but with the port on the bottom, it's too easy to inadvertently lean it on the cable when using it while plugged in, and if the port isn't stable to begin with, this sort of issue can develop.
I'm still in warranty, and will be receiving a replacement shortly. As a precaution, I've bought a Qi wireless charging receiver adapter and charging pad (very reasonably priced, off Amazon), so inserting the adapter into the brand new port and keeping it there should keep it from ever becoming unstable with use.
Other than this one issue, I absolutely love this phone, it's amazing. Enjoy!
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