Aldershot Town manager Andy Scott said complacency was to blame for Tuesday night's defeat by Burton Albion.
Despite taking an early lead, Town suffered their first loss since Scott replaced Dean Holdsworth in February.
"The first 20 minutes was the most comfortable we've been since I came in," Scott told BBC Surrey.
"Then everyone started thinking they could do something different. We took our foot off the gas and allowed them some momentum to get back in."
He added: "We gave the ball away cheaply and conceded cheap free-kicks which allowed them to fire balls in the box and get the impetus."
The Shots had drawn four and won two in their last six matches, a run that had lifted them from second bottom of League Two to 20th and three points clear of the drop-zone.
Tuesday's defeat saw them drop a place and although they remain three points above the relegation zone, each of the three sides below them have a game in hand.
"It's disappointing because that performance was such a dip from the last four games," Scott continued.
"I could understand if it was fitness, if we'd dropped the tempo but it wasn't. It was not doing all those things we'd been doing so well.
"But there's a reason we've come into the football club and it's because there are problems. Now we've seen the frailties that hadn't been evident so far we shouldn't be surprised.
"I'm not going to be harsh on the players. The lads deserve a lot of credit for the recent run and we just need to realise what we've done wrong and move on to another big game on Saturday."