Barnstaple Town let a first-half lead slip with a 2-1 defeat at Warminster Town in the Toolstation Western League this evening.
Dave Pearse headed them in front after a fine cross from Jed Harper-Penman but Barum were undone by goals from Gino Necco and Jack Miluk in the second half.
A third match without a win has dented their chances of a top-three finish in the First Division and manager Barry Yeo admitted it was an "annoying and frustrating" evening in Wiltshire.
"We had a really good first half, a tremendous tempo about us," he said. "The front three looked really lively and the attitude was spot-on.
"We never got going in the second half. They showed more desire.
"We can't say we're going to keep learning because we are not at the moment."
Playing with a three-man attack of Pearse, Harper-Penman and Billy Tucker, the visitors made a bright start and were unlucky not to go ahead when Josh Phillips had a goal ruled out for offside.
Yeo felt a change in formation did not help his team in the second half when Jimmy Thorne was beaten by clinical finishes from Necco and Miluk.
"At 1-0 I changed it and went 4-4-2 and I probably shouldn't have to be fair," said Yeo. "I have got to take partial blame."
Barnstaple are eighth in the table ahead of the trip to Roman Glass St George on Saturday while Warminster are in 19th place.
Barnstaple Town: Jimmy Thorne, Kyle Paine, Josh Phillips, Aaron Harper-Penman, Liam Gregory, Ross Jones, Jack Jenkins, Shaun Copp, Jed Harper-Penman, Dave Pearse, Billy Tucker. Subs: Kieran Jewell, Mitch Cisneros, Karl Baggaley, Ryan Turner.