NIGEL Clough says mistakes cost his team the points against a confident Luton side.
The home team ran out 2-0 winners with a goal in each half - both coming during spells when Albion seemed in control of the play.
The Brewers manager said: "We made two mistakes and were punished.
"I was very pleased with the way we started the game in the first 15 minutes and then we made a mistake with Jake Hesketh switching off and letting their lad in to score a goal.
"We are chasing the game from that point and then in the second half we gave away a penalty. We have given far too many away, especially away from home.
"We need to start getting clean sheets and then coming away with at least a draw.
"It's a familiar pattern for us making mistakes and losing the game and we have to stop that.
"We were on top in both spells when they scored and that is frustrating."
It has been a physically draining week for Albion with three away games in a row.
Clough said: "We were tempted today to make changes and bring five or six players in, but we went with the same players and in hindsight we should have rested a few today. We thought the lads were on a high and there was no question over the effort that has gone in again today. That has been good all week but we weren't at our freshest against a very good team.
"But the level of the performance wasn't bad again. We have to make more of the opportunities around their penalty area and we have to stop making mistakes. I didn't see them make too many today.