Hi, so i bought an LG Spirit 4g quite a while ago now... and after about 3 weeks of having the phone it just stopped working... it was whilst i was out at a friends and charging the phone, the phone was about 42% charged so i definitely had enough power to function... but as i returned home it had turned itself off.. and since then it doesnt respond to being on charge, trying to turn it on, rebooting it... its just doing absolutely nothing.. any ideas as to why ?