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I have a mid-2012 MacBook Pro running Catalina. Recently my computer just went black -- and I could restart it easily enough. It was as though it went to sleep. I could restore the windows and apps running too. But this has happened a few times before this year, and it's weird and scary. The only real hardware changes I ever made were replacing the old HD with a solid-state. I've replaced the battery too. And the HD cable a few times. I have 8GB installed; those are new (I don't recall if they are 3rd party, I got them from an authorized dealer tho)

I just checked console and put "shutdown" (no quotes) in the search bar and saw this

2020-09-16 08:25:42: * Setting up kill event listeners
2020-09-16 08:25:50:   - successfully setup kill event listeners
2020-09-16 08:25:56:   - waiting for logout...

I am curious what that means, and I looked through the system logs and to this less-technical user it's a mass of stuff I can't decipher. I am not even sure what to look for and where but here is a snippet of the system log from that time

Sep 16 08:25:41 ipad VTDecoderXPCService[750]: DEPRECATED USE in libdispatch client: Changing the target of a source after it has been activated; set a breakpoint on _dispatch_bug_deprecated to debug
Sep 16 08:25:41 ipad VTDecoderXPCService[750]: DEPRECATED USE in libdispatch client: Changing target queue hierarchy after xpc connection was activated; set a breakpoint on _dispatch_bug_deprecated to debug
Sep 16 08:25:42 ipad com.apple.xpc.launchd[1] (com.apple.coreimportd): Unknown key for dictionary: NoEnvironmentVariables
Sep 16 08:25:46 ipad com.apple.xpc.launchd[1] (com.apple.xpc.launchd.user.domain.501.100007.Aqua): Caller not allowed to perform action: seedusaged.720, action = service removal, code = 150: Operation not permitted while System Integrity Protection is engaged, uid = 501, euid = 501, gid = 20, egid = 20, asid = 100007
Sep 16 08:25:47 ipad com.apple.xpc.launchd[1] (com.jdibackup.ZipCloud.autostart[733]): Service exited with abnormal code: 1
Sep 16 08:25:56 ipad suhelperd[774]: objc[774]: Class SUReachabilityMonitor is implemented in both /System/Library/PrivateFrameworks/SoftwareUpdate.framework/Versions/A/SoftwareUpdate and /System/Library/CoreServices/Software Update.app/Contents/Resources/suhelperd. One of the two will be used. Which one is undefined.
Sep 16 08:25:56 ipad suhelperd[774]: objc[774]: Class SUPrinterScan is implemented in both /System/Library/PrivateFrameworks/SoftwareUpdate.framework/Versions/A/SoftwareUpdate and /System/Library/CoreServices/Software Update.app/Contents/Resources/suhelperd. One of the two will be used. Which one is undefined.

Anyway I thought it might be overheating but the machine doesn't feel hot.

This has happened once or twice before. It seems I may need a new logic board, but I wondered if I can adjust the fan speed somehow, and if that might help as I am told (and looking through some related issues on this forum) that it's a heating issue. But again, the machine doesn't feel particularly hot (but OTOH it was on a table and desk that last times this happened)

Anyhow any thoughts appreciated - I really am trying to decide whether to

a) get a new laptop. This was a 2015 build but it may be hitting the limits of what can run Catalina. If I get a new laptop I'd like one with the ability to hardwire connect an output monitor (I teach and sharing screens with the Promethean board is useful, but sometimes wireless doesn't work so I need to do the HDMI outputs). Maybe an old used 2015 model or something?

b) replace the logic board, I can do that for about $300 total. PITA, but I can probably do it, and anyone with experience here I'd love to hear from (i.e. any special stuff I need like should I buy adhesive, or expertise, things I should be aware of before I attempt, that kind of thing)

c) check some other issue this might be

Thanks in advance for all your time and help

ETA: Noticed that the computer seems to shut down when I close the lid, too, though the apps restore when I open it up (I hear the startup chime and it goes to the login screen)

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