Pushing your Mac to the max!
HighLoad is a great application for detecting something wrong with your computer. It is actually being used by the Genius in the Apple Stores to find issues. It is especially good with intermittent problems. The application is not designed to give you the info about what went wrong however, but it can prove you that everything is going fine or you can check the logs to find precisely what's the problem. The application also lets you rebuild the Spotlight index and clear the system cache. You can learn more or download HighLoad here from MacUpdate.