Originally posted by Vie
The only way that you can lose your CFW is by updating the firmware. All that this is doing is rebuilding the database, so you won't lose your firmware. Has this always happened, or is it a new issue? Have you messed with any settings in Rebug Toolbox, Debug Settings MultiMan ect. ? If so, depending on what it is, you might want to try reverting those changes.
UPDATE on this issue**** MW3 will let me play offline Survival Mode without shutting down. I just played for two hours straight. my temps are below 60 degrees...... both online and offline though, but it seems the system shut off only happens when I am playing Online games with it. Does this help to narrow down the problem?