macbook pro 15' retina display (late 2014) randomly crashing

To help troubleshoot your Mac, I would suggest that you consider using EtreCheck and posting the resultant report for us to review. (Note: The EtreCheck report does NOT contain any personal information.)

• You can download EtreCheck fromhere.
• Start EtreCheck from a normal user account. Optionally, you can run it from a user account with Administrator privileges.
• Select a problem from the drop-down menu to enable the "Start EtreCheck" button. Optionally, you can add comments on what issues your Mac is experiencing, especially to aide others with similar Mac issues.
• Click on Start EtreCheck
• Allow the program to run to completion.
• When done, select Report from the left-side window to display it.
• Select the "Share Report" icon.

  Select Copy Report

• Paste the report to your reply post.

Ref: Using EtreCheck - ASC (etresoft)

There are panic logs stored at:

~/Library/Logs/DiagnosticReports

any with Date&Time and ending in .panic could be copied and pasted here.

Please do not copy more than 20 lines of other crash reports, or anything after the words "Binary Images". These are only useful for developers actively debugging your system.

Unfortunately, erasing your drive also erased any stored up evidence of why this was happening.

Have you run Apple Hardware Test or the diagnostic provided by Internet Recovery?

Are you trying to run EtreCheck in a standard or Administrator user account? If standard, try an Administrator one.