Sean Dyche admitted his players were below-par as the Clarets saw a two-goal lead slip in the 2-3 home defeat to Crystal Palace.
Boss Dyche insisted the display was only the second time this season (following WBA away) that his side slipped below their usual high standards.
The defeat saw Burnley slip from a possible 12th to 17th in the table.
Dyche said: “It was a strange type of game because we went 2-0 up and to be honest I didn’t think we were playing that well.
“I certainly wasn’t thinking it was a done deal, by any means.
“But they are soft goals by our standards, particularly the second one, so soon after half time.
“That’s not like us, but it gave them a lifeline and was a sucker punch at the end.
“We pride ourselves in the way we play and the organisation and framework and all the things I take about and they just weren’t delivered today.
“There’s a balance to be had from our mantra of trying to win games and not being naïve enough to think you can get away with it.
“But that’s unusual from this group and you have to take it in context for the whole of the season and this is a clear reminder.
“I reminded the players afterwards that we cannot afford to come of our performance level, not even by 1%. Not at this level.
“At this level you have to be on top of your game all the time and we weren’t there today.”
Ben Mee’s first Premier League goal was soon followed by Danny Ings’ third in as many starts as Burnley spring form the traps inside 16 minutes.
But goals either side of half time from Dwight Gayle and Jason Puncheon levelled the scores, before Gayle struck late on to earn a third straight win for new boss Alan Pardew.
Dyche added: “They are a club a year wiser from being in the Premier League and they played tough today, which was tough for our players.
“There were a lot of fouls and a lot of breaking up play; all the things that happen in game management in the Premier League.
“But at the end of the day it’s about us and we didn’t perform in the manner we are used to here.
“We live and learn and we move forwards though and we’ll bounce back from this, I’m sure.”