2018 Mini random reboots: Have I tried everything?

Slartibartfast42

macrumors newbie
Original poster
May 4, 2019
20
1
Surrey, UK
Hi. I'm not seeking a solution here (though if you have one, do share!), rather, I was wanting to check that I've tried all sensible solutions before going to Apple.

Symptom: Every now and then the Mini freezes for 5 seconds and reboots.

Solutions tried: Zapped PRAM, tried TechTool Pro, used Diagnostics start up, reinstalled OS (local copy) via recovery mode. I've disconnected all non-essential peripherals and removed all unnecessary extentions & start-up apps. I did have a hunch that Time Machine was the issue as often that external drive would dismount automatically. However, tried with different drive, cable and port and made no difference. Disconnecting TM drive and switching TM off in the OS made no difference.

Next step:
Next step is to start up in Safe Mode and leave it on for the day. Is there an issue with doing this as my anti-virus/anti-nasty stuff software wouldn't be running (Intego). The only thing I can think of is doing after that is a complete clean install: wipe, format & check SSD. Then install apps one at a time (to avoid just restoring a problem). Then if that doesn't fix it - I'd contact Apple.

Any thoughts as to other things to try please?
 

Fishrrman

macrumors P6
Feb 20, 2009
18,552
6,281
OP:

I don't think the Apple-installed RAM has anything to do with it (unless, possibly, there is a "weak connection" with one of the RAM DIMMs to its slot).

The next time this happens, and you get a "spontaneous reboot", and you get back to the finder, do you get the msg "your computer was restarted because of a problem"?

If so, try clicking the "report" button (even if you're not going to report it to Apple), and you should see some information about WHY the restart happened.

If you get this far, do you see anything in it that say "bridgeOS" ?
That would indicate the "t2" chip inside may have had something to do with it.

Personal experience:
My 2018 Mini ran without t2 crashes until about a week ago.
Then I started getting some reboots, always while the Mini was "unattended".
The reports said "bridgeOS" error.
I had recently done a "security update", and may have changed/deleted a few files here and there.
In any case, I used the special internet recovery mode "shift option command R" to reinstall Mojave, and it seems to have "healed up"...
 

Erehy Dobon

macrumors 6502a
Feb 16, 2018
769
626
Next step is to start up in Safe Mode and leave it on for the day. Is there an issue with doing this as my anti-virus/anti-nasty stuff software wouldn't be running (Intego). The only thing I can think of is doing after that is a complete clean install: wipe, format & check SSD. Then install apps one at a time (to avoid just restoring a problem). Then if that doesn't fix it - I'd contact Apple.

Any thoughts as to other things to try please?
I suggest you disable Intego (after making a full backup on your system) and let it run for a while (day or two) logged into a newly created user account.

If there are no crashes during that time, that might point to a problem with A.) Intego, B.) something specific in your user account, or C.) both.

Another option would be to install a fresh copy of the same version of macOS on an external drive, boot that and run it for a while. If there are no reboots, that might indicate some sort of damage to the operating system on your normal boot drive.
 

Slartibartfast42

macrumors newbie
Original poster
May 4, 2019
20
1
Surrey, UK
I suggest you disable Intego (after making a full backup on your system) and let it run for a while (day or two) logged into a newly created user account.
Just had my first reboot where I could get at the Report (mentioned earlier). No mention of BridgeOS but amongst the gobbledegook I can see that Little Snitch & Intego are the only kexts (whatever they are - presumably the low-level parts of those apps) running, so will try disabling and running for a day as you suggest. Thank you.
 

MevetS

macrumors member
Dec 27, 2018
51
28
Earth
Just had my first reboot where I could get at the Report (mentioned earlier). No mention of BridgeOS but amongst the gobbledegook I can see that Little Snitch & Intego are the only kexts (whatever they are - presumably the low-level parts of those apps) running, so will try disabling and running for a day as you suggest. Thank you.
kext = kernel extension.
 

honestone33

macrumors 6502a
Hmm, interesting and revealing discussion. I recently purchased a late 2018 Mac Mini with a core i5 processor. It has the latest version of Catalina, OS 10.15.3, on it via a clean, fresh, virgin installation. And I use just about all third party software (VLC, LibreOffice, Transmission, SuperDuper!, Onyx, Tech Tool Pro, Quicken 2017, EasyFind, AppCleaner, Thunderbird, Brave, VueScan, VLC Streamer, 1Password, SMART Utility, ClamXAv, GrandPerspective, etc.). So far, I have yet to encounter such issue with the T2 chip.

Any ideas, thoughts, etc. as to what causes such issues?
 

Slartibartfast42

macrumors newbie
Original poster
May 4, 2019
20
1
Surrey, UK
Well - I've gone for the nuclear option and completely erased the SSD, reinstalled Mac OS and then re-installed all the apps (rather than just restore from a backup) one by one, and all seems OK. Feels good to have a nice clean SSD with a lot of carp deleted :)

Thanks for input.
 

honestone33

macrumors 6502a
Well - I've gone for the nuclear option and completely erased the SSD, reinstalled Mac OS and then re-installed all the apps (rather than just restore from a backup) one by one, and all seems OK. Feels good to have a nice clean SSD with a lot of carp deleted :)

Thanks for input.
Good job! Hopefully with all my daily cleanup that I do, plus the weekly usage of Onyx and Tech Tool Pro, and finally my weekly usage of SuperDuper!, my system is "lean, mean, and clean",.just about all the time. That would mean that if I needed to do a restore from my backup, the backup itself would be just about 100% clean. (I also, once a month, run ClamXAV, a virus detection program (sometimes I'll also download and run Malwarebytes too). Fortunately, nothing nefarious is even found).
 

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