Engine failure...so it happened to me.

Just about now, was starting another test flight for the spoilers, and at about V1, a callout Engine Failure - this really appears as random, because I was starting the SAME flight every time, with same settings, same fuel and everything. And just now, as I was slowly pulling the stick (danger of tailstrike with 737-900), just as the front gear raised a bit, engines shut down and I went to the stop.And, I was unable to restart the engines after that.What's the deal here?