Alex Morris said it was individual errors alone which cost his side all three points against Mansfield Town on Saturday.
The manager was left aggrieved by mistakes in the build-ups to the Stags’ strikes, in the 87th and 93rd minutes, after Crewe had led 1-0 thanks to Courtney Baker-Richardson.
But he said there were still positives from a performance which so nearly earned a maximum return.
Morris said: “Two errors cost us the game. It wasn’t anything tactically, it wasn’t anything mentally, it was two errors where the basics weren’t done properly.
“If we’d have won this game 1-0 there’d have a lot of positives coming our way.
“But because the margins for error are so fine in any game of football, particularly at this level, two errors turned everything on its head and peoples’ mindsets will have been different walking out of that stadium.
“It’s so frustrating. History has repeated itself because we have also given points away against Northampton and Stevenage.
"It has to stop otherwise we won’t end up anywhere near as high as we want to.
“Eight points have been blown across those three games at home.
“It’s back to the drawing board, but there is plenty to be pleased with. We have a defensive base we can build on, but we need to connect in that final third often enough, we all know that. That’s the riddle for us all to solve.”