I have a Samsung Intensity III that I bought a few months ago. Recently it has not been charging correctly and sometimes not at all. The charger port is free of dust, and anything else that may block charging. It will not charge on a wall charger(or any charger that only uses 2 wires) but will charge when connected to the laptop(using a cord that contains all 4 USB wires). Anyone else have this issue? Any solutions?