hi there.... i'm facing some problem wif my iphone right now... yesterday when i turn on a iphone game... while loading half... da screen suddenly turn black.... den no matter wat button i click also no respond.... den after about 5 min... it turn on again.... n by dat time start... i found dat my i phone battery drain very very fast.... normally i can charge it once after 2 day use... but i need to charge 2 time perday right now.... izzit my ipone got prob??? da phone prob or battery prob??? if battery got prob go repair need about how much???