My phone was perfect for about a week, but now it has started to act buggy. It all started with the phone locking up while trying to use handcent and having to do a battery pull. Ever since it hasnt been right, its been more finicky with dropping data connections and not coming back, and having to toggle airplane mode. And just recently today, it locked up in my pocket, and started getting really warm, and I had to pull the battery out to restart it. So is this one turning lemon, should I exchange it for a new one?