Macbook pro 15 inch crashes every other day for no reason, how can i resolve this issue

my macbook pro is connected to an external monitor and i use apple key board and magic mouse. for the past few weeks, it has been crashing almost continously (at least once or twice a week) and i have to restart the computer. this has never happened before and i haven't added any new software to it that i may think can cause the problem.
what can i do to check on this and how can i fix it.
thanks

By crash do you mean there is a four language screen asking you to restart?
If not, then that really isn't a crash, and you need to learn how to break out of the issue in question.
If it is, then what you are witnessing is a kernel panic*:
http://www.macmaps.com/kernelpanic.html
Your Console application will have System log files which may indicate what application or driver was trying to launch at the time of the panic.
The non-kernel panic pseudo crashes come in a variety of flavors:
1. Spinning colorwheel as a result of a single hung application.   Try command-option-escape to bring the force quit window to force quit the offending application which usually will be highlighted in red. Select it, and click force quit. Your data will not be saved from the saved app, but it does say the application in question may have run out of disk space*:
http://www.macmaps.com/diskfull.html
Or is incompatible with some driver or operating system data on your machine.
2. Spinning colorwheel as a result of a system optimizer. Don't trust any application that cleans system cache. Doesn't matter if it is browser cache, but system cache should be only fixed in troubleshooting situations, on
backed up systems*:
http://www.macmaps.com/backup.html
3. Spinning colorwheel as a result of a driver issue.   If the driver in question hasn't been tested with the operating system, it may fail to work when certain peripherals are connected.
4. Frozen mouse pointer with same symptoms as 1,2,3.
5. Splotched pattern under mouse pointer.   Generally means a hardware issue with the graphics chip.
6. Unexpectedly quitting applications or frozen applications as a result of no kernel panic nor compatibility issue. Thsoe may happen if they run into bad RAM without panicking*:
http://www.macmaps.com/badram.html

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