Can anyone help me with my HTC Amaze 4G?

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http://androidforums.com – i just got a replacement phone from my insurance provider and up until the last couple of days or so everything was fine recently though, i've had a problem with the battery. the battery life is pretty decent, but every once in a while the phone will just randomly shut off, then when i turn the phone back on the battery will be drained by a significant amount. just now my battery was about 30%, it shut off when i was playing a game (note, i dont think its the game because its happened before when the phone was idle in my pocket too) and when i turned it back on the phones battery went from a (General)