Lee Bell admitted Sutton’s 93rd minute equaliser was a sickener on Saturday – but says Crewe Alexandra must stop letting leads slip.
The Railwaymen have now lost 22 points from winning positions this term.
Though the Manager would not criticise his players after they battled for more than half-an-hour with 10 men following Rod McDonald's red card, he conceded it is an issue which needs rectifying.
Bell said: “This isn’t unlucky anymore – this seems to be the theme. It really stings and hurts. I'm gutted for the players - but we can't keep letting it happen.
“With 11 men, we win the game, so it's a hard one to take. But we need to keep 11 players on the pitch.
“It’s unbelievably frustrating, but I can't fault the players. We had to withstand pressure, the balls into the box were relentless, and I thought we stood up to it. But all they needed was one moment.
“It's hard to play against Sutton. The first half was as bad a game of a football as I've ever seen. But they are pushing for a Play-Off position, and I'm not knocking how they play.”
He added: “The fans behind the goal travelled in their numbers again. The away support we've had this year has been brilliant, even when we've not been doing so well.”
Crewe are now six games unbeaten, as they prepare for the visit of Salford City on Friday (7.45pm).
Bell added: “It's six unbeaten, but we should have more wins. We've got to use how the staff feel, and how the players feel, and take that into Friday. We want to win football matches and our fans deserve to see us win football matches.”