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Why is my computer shutting down for no reason?

My aluminum MacBook is about 2 years old now. I use it very often, so perhaps this is just normal? It turns off randomly, without warning, with more than enough battery power left. It's happened 4 times in the past month or so and I'm beginning to get worried! It just happened today, after I unplugged my adapter for about 15 minutes. I left the computer off for 4 hours. When I returned to it, I plugged in the adapter and turned on the computer...turns out there was still 55% of the battery left! I really hope someone can help me figure out what the problem is...

Here is what my System Profiler says about my Power:

Battery Information:

Model Information:

Serial Number: DP-bq20z951-3a2c-4a24

Manufacturer: DP

Device name: bq20z951

Pack Lot Code: 0000

PCB Lot Code: 0000

Firmware Version: 002a

Hardware Revision: 0005

Cell Revision: 0100

Charge Information:

Charge remaining (mAh): 2338

Fully charged: No

Charging: Yes

Full charge capacity (mAh): 3245

Health Information:

Cycle count: 551

Condition: Good

Battery Installed: Yes

Amperage (mA): 385

Voltage (mV): 12293

System Power Settings:

AC Power:

System Sleep Timer (Minutes): 15

Disk Sleep Timer (Minutes): 10

Display Sleep Timer (Minutes): 15

Automatic Restart On Power Loss: No

Wake On AC Change: No

Wake On Clamshell Open: Yes

Wake On LAN: Yes

Display Sleep Uses Dim: Yes

Battery Power:

System Sleep Timer (Minutes): 0

Disk Sleep Timer (Minutes): 10

Display Sleep Timer (Minutes): 0

Wake On AC Change: No

Wake On Clamshell Open: Yes

Display Sleep Uses Dim: Yes

Reduce Brightness: Yes

Hardware Configuration:

UPS Installed: No

AC Charger Information:

Connected: Yes

Charging: Yes

Thanks for reading!

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This sounds like it could be an overheating issue. Has it been rebooting after you've been doing particularly graphics / cpu intensive processes? Watching online videos or playing games would be two fo the big ones. Older computers tend to accumulate dirt, dust, etc inside them after that long of a time. My first recommendation would be to clean out the inside of your computer.

To find out what kind of MacBook Pro you have, you can use our ID-Your-Mac tool. After you know which model you have, you can use one of our appropriate guides found from this MacBook Pro device page.

When you open it up, try using some canned / compressed air to blow out and remove the dust you're likely to find. Hopefully this will improve your situation. :)

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Dian will be eternally grateful.
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