Macbook Pro shut down by itself at 16%

I was using my month-old Macbook Pro as usual, and it suddenly shut off by itself. It had 16% battery when it happened, and wasn't plugged into the power adapter. I tried to turn it on again by pressing the power button at least 3 times, but nothing happened. So I gave up and tried to use my iPhone to find out what happened, but it suddenly turned on by itself. I heard that the Macbook tends to do a thermal shut-down whenever it's overheated or something (I'm not sure if it's true though) , but I'm still very concerned because I just bought it only a month ago! Here's some information about my battery that I've got from the system profiler:
Battery information:
  Model Information:
  Serial Number:          W01174C7KD3LA
  Manufacturer:          SMP
  Device Name:          bq20z451
  Pack Lot Code:          0
  PCB Lot Code:          0
  Firmware Version:          201
  Hardware Revision:          000a
  Cell Revision:          165
  Charge Information:
  Charge Remaining (mAh):          1397
  Fully Charged:          No
  Charging:          Yes
  Full Charge Capacity (mAh):          5400
  Health Information:
  Cycle Count:          19
  Condition:          Normal
  Battery Installed:          Yes
  Amperage (mA):          3542
  Voltage (mV):          11881
Operating system: OS X Lion
Is this normal? I really hope it's nothing serious because this is my first Macbook after so many years of using a PC - I'm enjoying using the Macbook Pro and I don't want any reason to change back to a PC. I'd appreciate if anyone can help me!

Just an update:
After it shut down by itself a second time, I couldn't even turn my Macbook on for a period of time even when I pressed the power button. After that, the Macbook did start up for about 2 or 3 seconds before shutting down by itself today. However, it was fine when I turned it on today, so it's working as per normal now. I've run some antivirus software, and nothing was found at all.
I hope the additional information will give you guys more idea as to what's happening. I'm glad it's working now but I'm concerned that it will happen again so I really want to resolve it, yeah. Do you think it might be a problem with the new OS?
Thanks for your help so far!

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