Truro City manager Lee Hodges says "one mad minute" cost his side as they lost 1-0 at Eastbourne Borough.
Ollie Rowe's header from a corner after 56 minutes was the different between the sides as stay bottom of Blue Square Bet South.
"It was just one mad minute of switching off at a set-piece," Hodges told BBC Cornwall.
"Someone's not taken responsibility to say 'He's my man, he's not going to score', and the ball's in the net."
He added: "We played ever so well and dominated again and we're walking in 1-0 because we've switched off at a set piece."
But Hodges, whose side are 12 points from safety after having a 10-point deduction for going into administration, feels Truro are better than their results suggest.
"The lads have worked so hard and created so many chances.
"We're competing, giving it our all with 13 players at the moment, and one or two more would be a nice addition.
"There's not too many teams that I have felt have really done us over, we've competed in every game and it's a really tight and close league this year."