(To start, I should have posted this issue earlier, but due to my hectic life as of lately, I am just now reporting it.) After I dropped my original iPhone 4 at a coffee shop and broke the screen, I sent it into Apple, and early-September, received a replacement iPhone 4. But, since the day I got it (which, by the way was brand new, and surprisingly not a refurbished model) the phone will turn off every morning by itself. I first noticed it when, right before I left for work, my phone had turned off without warning.I hadn't checked the battery, so I figured it died. After a couple of attempts at turning it on via the On/Off button, I discovered I have to do a hard reset to have it come back on. This has been going on for nearly a month now, and quite honestly, I cannot stand it anymore. One moment I'll be texting someone and when I set it down for a minute or less, the phone has already turned off! I'd assume the issue might just be a partially-defective model. But, is this common?