one other thing to check is if you installed any kernel extensions...inside Apple engineering, folks with kernel extensions could get bizarre errors since the quality of them could screw up stability with all sorts of symptoms.
replykextstat | grep -v com.apple
would show anything _maybe_ troublesome, but not guaranteed related.
In my case no kernel extensions. Every few days the computer freezes with a beachball and/or screen starts falling apart in large blocks randomly shuffling around the screen and I need to power it off. The first logicboard also added a bunch of pink noise in a few clusters all over the screen. Whenever I got close to freeze my power charging beeps were getting more and more frequent up to around 1 beep per 3 seconds with USB charger in (the beep when you insert power adapter into USB port).
replydefinitely unusual, sounds like hardware issue (as someone else mentioned)
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