Logcat Extreme can be installed from the Play store. Run it, hit record, hit power button to put phone to sleep, and wait. It'll save the file under /sdcard/logcatx
Sent via the magic of an Optimus G (E971) running CM 10.1.
When you're phone does reboot - note the battery level and whether you had it plugged in or not and send me a PM for my email address - Im going through logcats right now trying to find this thing or at least an idea.
Edit: Sorry that was for L1qu1d
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