This problem has been plaguing my phone for such an incredibly long time. There will be periods of weeks where it won't reboot a single time, then there will be some days where it does it 3 times a day, several times a week.
I am running the paid version of launcherpro and I have lookout too. I've been unable to pinpoint the problem so far. I have found that when I end all tasks, that the problem goes away for a few hours. The four lights on the bottom don't stay lit, freeze, and possibly reboot my phone. I'm going to disable the antivirus part of lookout though and just keep it for the backup part.
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