Having the same problem on my 15". Tried transfering over 500GB from one external (WD My Passport) to a Samsung SSD. It crashes after roughly 350-365 GB transferred. I'm trying transferring with smaller file sizes and see if that makes any difference. I haven't been watching it to see if it's an elapsed time or amount transferred that triggers it or if there is any consistency at all. I guess while I'm on my overnight shift at the first aid squad I'll play around with it and contact Apple. I'll hop on here with what I figure out.
Update: I tried copying files over for the third time this time just folder at a time trying to keep the file sizes smaller & the system locked up with no inputs working and then restarted itself. Contacted Apple who recommended an appointment in the Apple Store & a possible replacement as a solution. I'll let everyone know what I come up with after my appointment tomorrow. At the moment I'm seeing if copying files over to the MBP and then moving those files to the other external drive makes any difference whatsoever.
Second Update: I was able to watch for the error message that preceded the shut down and it was an image file (raw CR2). I copied that over to the desktop and then tried copying that over to the other external and it crashed again. Tried opening it in Photoshop CC 2017 & it gave me an error message about the graphics acceleration and needing to update the graphics driver. Once I removed that file from the folder I was trying to copy I had no more issues.
Update: I tried copying files over for the third time this time just folder at a time trying to keep the file sizes smaller & the system locked up with no inputs working and then restarted itself. Contacted Apple who recommended an appointment in the Apple Store & a possible replacement as a solution. I'll let everyone know what I come up with after my appointment tomorrow. At the moment I'm seeing if copying files over to the MBP and then moving those files to the other external drive makes any difference whatsoever.
Second Update: I was able to watch for the error message that preceded the shut down and it was an image file (raw CR2). I copied that over to the desktop and then tried copying that over to the other external and it crashed again. Tried opening it in Photoshop CC 2017 & it gave me an error message about the graphics acceleration and needing to update the graphics driver. Once I removed that file from the folder I was trying to copy I had no more issues.
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