Mac Pro 6, 1 (Late 2013) is constantly restarting and getting error as "Your computer restarted because of a problem"

Hi everyone,

I’m hoping someone might be able to shed light on an issue I’m having with my late 2013 Mac Pro (12-core, 64GB RAM, 512GB SSD, macOS Monterey 12.7.6).

Lately, the machine has been restarting unexpectedly. It doesn’t seem to happen during any particular activity — my usage is fairly light overall, with the most demanding app I regularly use being Lightroom, and even that not daily.

Here’s what I’ve tried so far:

• SMC reset
• PRAM reset
• Erased and clean-installed macOS Monterey
• Swapped in the original Apple SSD
• Brought it to an Apple Store (in Paris), where a RAM-related issue was suspected
• Tried multiple RAM combinations in different slots
• Installed new RAM from OWC
• Ran extended memory tests overnight (no issues reported)
• Used EtreCheck (no major flags)
• Ran CPU stress tests (Cinebench, Heaven, etc. – all completed without crashing)
• Reapplied thermal paste and thoroughly cleaned the machine internally

Temperatures seem fine — usually under 70°C, and I use a fan control app to help manage thermals.

After each unexpected shutdown, I receive the “Your computer restarted because of a problem” message. There’s no clear pattern, and no heavy usage at the time of crash.

I’ve read similar reports from other Mac Pro owners, and in one case, a user traced it to the CPU. I’ve sourced a replacement CPU and plan to install it soon to see if it helps.

If anyone has run into something similar or has ideas I haven’t considered, I’d be grateful. I understand this machine is getting older (purchased in 2015), but I’ve always loved it and would like to keep it running smoothly for as long as possible.

Thanks in advance!

[Re-Titled by Moderator]

Original Title: Mac Pro 6,1 2013 is constantly restarting in spite of