MacBook Pro 15" Retina - crashes/restarts if/when using trackpad and on battery.
MacBook Pro 15" Retina - crashes/restarts if/when using trackpad and battery [only in this combination].
To rephrase, MacBook Pro doesn't crash if/when plugged into power supply and USB mouse, [must be this combination to prevent crash/restart].
Makes sense!? [facepalm]
MacBook Pro 15", macOS 10.14