My 8350i turns off randomly

My 8350i start to turn off randomly a lot of times
The OS is
BlackBerry Handheld Software v5.0.0.1737 (Multilanguage)
Package Version: 5.0.0.1737
Consisting of:
Applications: 5.0.0.1074
Software Platform: 3.2.0.34
I didn´t istall any extra aplication and the meromy is clear , don´t have any picture,aditional file...
I read about this problem in many fourums and I reload the OS many times
it´s a question of harware? product quality?
what´s going on?
The problem persist

It doesn't matter how long you've been running the computer, the heat can build up fast. On my iMac, I can shut my computer down overnight, boot it up in the morning, and the temp on the CPU will be around 114 degrees F. However, if I start to do anything intensive like rendering video or playing a game full screen the temp reaches the point where the fans have to kick in high gear w/in about 5 minutes. So 30 minutes is plenty of time to get the heat built up. Besides, I think that the new C2D's are supposed to run cooler, so that means that the temp limit will be reached faster.
Also, like myhighway suggested, the RAM might be insufficient enough to do graphics-intensive tasks or other RAM utilizing tasks. When I got my iMac, it had 512 MB of RAM. That barely cut it for rendering video. Even with 512, it took over 2 hours to render just an hour of video. After that I got another 512 stick from Apple, and the rendering is real-time now. Also like myhighway suggested, the 3rd party RAM you put in there could be faulty, leaving your computer with just 512 MB of usefull RAM.
Hope this helps
Trevor

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    If restoring the iPhone resolved the issue, go to step 4. If restoring the iPhone did not solve the issue, seek service.
    Thanks for coming to the Apple Support Communities!
    Cheers,
    Braden

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