<div>
First.......... check for any firmware update - hope this provides a solution to your problem.<br />
<br />
<a href="http://support.apple.com/kb/ht1237" rel="ugc">http://support.apple.com/k<wbr />b/ht1237</a>
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First.......... check for any firmware update - hope this provides a solution to your problem.

http://support.apple.com/kb/ht1237 [http://support.apple.com/kb/ht1237]

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which model do you have?<br />
The power supply could be on it's way out...<br />
try using the laptop on power alone, with the battery removed and see if this affects anything.<br />
Do you have much battery capacity without power cord plugged in?
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which model do you have?
The power supply could be on it's way out...
try using the laptop on power alone, with the battery removed and see if this affects anything.
Do you have much battery capacity without power cord plugged in?

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riplus: &nbsp;Thanks. However, I have the latest firmware version.
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riplus:  Thanks. However, I have the latest firmware version.

<div>
roylong: &nbsp;Version 1.1<br />
<br />
Also reads battery remaining incorrectly at 99%. Says 4:22 - However, at 50 % = &nbsp;40 minutes.<br />
<br />
Why would removing the battery affect anything? <br />
BTW - Problem usually occurs when plugged into a second monitor. Thanks
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roylong:  Version 1.1

Also reads battery remaining incorrectly at 99%. Says 4:22 - However, at 50 % =  40 minutes.

Why would removing the battery affect anything?
BTW - Problem usually occurs when plugged into a second monitor. Thanks

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<div class="content wysiwyg-content">
I bought my Mac Book Pro 4 years and 3 months ago. &nbsp;Recently, (last 6 months) it has been<br />
restarting by itself about &nbsp;2 -3 times /day. I have read many posts from people<br />
having a very similar issue but no solutions. Any ideas?
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I bought my Mac Book Pro 4 years and 3 months ago.  Recently, (last 6 months) it has been
restarting by itself about  2 -3 times /day. I have read many posts from people
having a very similar issue but no solutions. Any ideas?

Why does my MacBook Pro restart spontaneously?

Mac OS X is the desktop operating system from Apple Inc., found on Macintosh computers. OS X consists of a Mach/BSD-based kernel, operating system interfaces primarily based on FreeBSD and additional frameworks (written in C, C++ and Objective-C providing user interface and application-level services.

Mac OS X

All of Apple's hardware is produced solely by Apple Inc., who determines internal systems, designs, and prices. Apple buys certain components wholesale from third-party manufacturers. The current Mac product family uses Intel x86-64 processors. All Mac models ship with at least 1 GB RAM as standard. Current Mac computers use ATI Radeon or nVidia GeForce graphics cards and include a dual-function DVD and CD burner, called the SuperDrive. Current Apple hardware includes the iPad, iPhone, iMac, Mac Pro, Macbook, iPod and Apple TV. Discontinued hardware includes the Apple I, Apple II, and the Apple III, the Lisa, the Newton, the Quadra, Performa, Centris, Macintosh II and LC series, the Power Macintosh, iBooks and the MacBook.

Apple Hardware

Programs written for the Apple operating systems are distinguished from software created for other operating systems in that it must be approved by Apple for use on its devices, whether it is from Apple (Final Cut, iWork, Keynote, Logic Pro and GarageBand are popular titles), or is a third party application from Parallels, Nuance, Microsoft and Amazon, among many others.