Last time I had a charger, the plastic cover started melting which then caught on fire. if you see any defects just replace it
i know for a fact that asus laptops draw massive amounts of electricity when they get hot. i have one. cooling pad. or well ventilate it. it is a K50I?
Might be a similar problem tho. try using a fan pad. i find my computer last maybe 60% longer if it's kept cool.