I ran cinebench to see if such behavior occurs under any other load conditions. It was fine. Unfortunately I don’t have any other renderer or stress test software to continue testing.
I had a similar problem, which caused heat generation due to poor hardware contact and caused the hardware protection circuit to operate, causing the system to shut down.
These problems accumulate little by little over a long period of time, and when they occur, it is difficult to find the cause. (More and more various errors occur.)
Most of the time, the problem is solved by replacing the suspected hardware, but sometimes it is not resolved because the underlying cause is unknown.
It took me a month to solve this problem.
The above mentioned issues cannot be said to be the same, but please also suspect hardware issues.
99% of the time that I got weird crashes with any software it’s come down to permissions. Effectively the software needs to write certain temporary files to a certain folder and it’s denied to do so, causing a crash.
Mojave is pretty old. I would consider updating to Monterey or higher. Lots has changed since 2018 and there have been a ton of optimizations and bug fixes. .
That GPU is old and underpowered by most modern standards.
If you’re intending on staying in MacOS, I would highly recommend that you consider updating your machine, even a Mac mini M1 is bound to give you much better results.
Yeah its bizzare because in the 5 years the machine has served me well (knock on wood) and continues to be a champ otherwise. Which is why Im baffled as to why now?
There are various threads on a similar topic, none of which are resolved, genuine OEM macs, not hackmacs:
I’m considering taking the thing for inspection but Im in the middle of a project I need to deliver ASAP. Maybe theres something going on. Im gonna try to do the work on my laptop for now hope it can handle it. I wanna try to load linux on the machine with blender and see if the problem persists. Hope I wont end up with a hardware bill to pay.