Ah, Boeing?
Aero 11 - Rejected Takeoff Studies
And yes, usually there is some crew screw up involved. Think about it. Flight test crews head out to the airport knowing they are going to do rejected TOS. Crews headed for recurrent training know it's likely an engine will fail. Yet most high speed rejects aren't engine issues. On the line crews may repeat the standard mantra "I will reject for any master caution or master warning, an engine failure or ..." And yes, there's 2 seconds added for crew response time. History shows that may not be enough.