Apple has released MacBook SMC Firmware Update 1.1, an update for MacBooks that should resolve the “sudden shutdown” issue.

If your MacBook shuts down randomly during use, a downloadable firmware update is now available that resolves this issue.

The MacBook SMC Firmware Update v1.1 improves the MacBook’s internal monitoring system and addresses issues with unexpected shutdowns. This update is recommended for all MacBook systems, including those that received warranty repair.

You can use the Software Update feature of System Preferences, or download the MacBook SMC Firmware Update v1.1 from Apple Software Downloads.

Note: If your MacBook is running Mac OS X 10.4.6, you won’t be able to see the SMC Update until you update to Mac OS X 10.4.8. Once you have updated your system software, the SMC Update will appear as an option in Software Updates. MacBooks running Mac OS X 10.4.7 will be able to download and install the SMC Update, so it is not essential that you update your system software, although Apple always recommends updating to the latest version of the system software.

If you continue to experience trouble with your MacBook after applying both updates or if your MacBook is in a state that will not allow you to install the updates please contact AppleCare for further assistance.