Unexpected restart link with airport and keychain

HI,
I experience some unexpected restart of my Mac book pro when it's inactive (and only when it's inactive). There is not a single line in the system.log or console.log that match the time of reboot. I didn't find a reproducible way of making it happening. Nevertheless, when airport cannot connect to a gateway because the signal is marginal and make an error seems to increase the probability to experience such a feature. I'm of course not talking about a kernel panic. There is not a single clue before the restart! The hardware testing provided by apple on Mac OS X DVD and with the apple care plan does not detect any issue.
On top of that it seems that when it starts to happen, it will happen any time you will reach the screensaver or lock the computer, if the screensaver is password protected. Switching of this option is usually not enought and according an other article of this forum, I added in ~?Library/preferences a com.apple.screensaver.plist with 0 value to askForPassword
Repairing the permission seems to help sometimes as well. But there is no key way of getting rid of it.
Moreover, from time to time the additionnal plist file I said is removed by another process (I'm the only user of my laptop and it happens several time). But still nothing reproducible.
I tried to mesure the temperature and log it, and it's not increasing at the time of the crash, on the contrary.
so any idea to fix, or at least to force a higher level of logging is welcome

OK, I came up with at least a "hack" to get me back up and running for the moment. I have another user account "test" on my powerbook that is pretty much a vanilla new account. Whilst reviewing what files had been changed during the upgrade I became fairly convinced some form of bad XML configuration parameter(s) in file(s) contained in ~user/Library/Preferences were behind the loss of network connectivity. I logged out, then logged back in as my "test" user and networking worked flawlessly which seems to confirm that indeed the problem lies not in shared system directories but in user configuration data. Anyhow I logged into my normal account (top right screen corner) whilst still logged into my test account and now networking remained enabled and operational.
I'll report back if I work out how to clean up this mess properly.
Ian

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