A poor first half hour cost Brentford dear as they slipped to their third defeat in four - this time a 3-2 home reverse against Swindon Town.
The Bees totally dominated the second half, and the later stages of the first, but were 2-0 down inside the first 21 minutes and a late Alex Revell strike, his second of the afternoon, proved to be the winner.
Carl Cort and Charlie MacDonald both scored for Brentford, and struck up a good understanding, but the hosts did not defend well enough to win the match.
Anthony McNamee struck a shot over early on for the hosts and within eight minutes they were ahead - the third successive home game Brentford have fallen behind inside the first ten minutes.
Jon-Paul McGovern played the ball inside and Revell latched onto it before lashing it high past Nikki Bull and in off the underside of the bar from a tight angle.
Sam Wood shot wide for Brentford and Ryan Dickson, returning after six weeks out with a knee problem, thought he had won a penalty when he darted into the box to pick up a MacDonald lay off and went down as he tried to get between Kevin Amankwaah and Scott Cuthbert but nothing was given.
Jonathan Douglas volleyed over for Swindon and the same man should have scored a second soon after.
Simon Ferry played a ball though and the flag went up for offside against Ben Hutchinson but the striker stood still and Douglas raced clear, his shot was saved by Bull and Marcus Bean beat him to head the loose ball away.
But minutes later the visitors were two up - McNamee cut in off the left and found space with a nice trick, he slipped the ball through to Hutchinson who had little problem slotting the ball past Bull.
Revell shot over soon after but Brentford - who were starting to squeeze the game and press the Swindon midfield - began to come into it.
Cort headed a Dickson cross onto the roof of the net, Sam Saunders and Bean had shots blocked and David Lucas saved an acrobatic effort from Wood.
The Swindon stopper saved from Saunders soon after and Cort swivelled and shot wide before MacDonald curled an effort off target.
The second half started how the first ended, with Brentford not giving the Swindon midfield room to play and causing their defence problems.
Bean volleyed straight at Lucas after good work by MacDonald and the Bees striker should have scored soon after.
Saunders came within a whisker of his first Brentford goal with a curling left footed effort that cannoned to safety off the post, it flew back to MacDonald who fired it over the unguarded net from ten yards.
Revell headed off target for the visitors but all the action was at the other end - Wood had a weak shot saved and then headed a Dickson cross against the post after a move involving Cort and Kevin O'Connor.
Saunders hit a left foot effort straight at Lucas and forced the keeper into another stop soon after before Brentford finally got the goal their play merited.
Cort spread the ball wide to Saunders and when the striker got it back he created a yard and fired the ball into the bottom corner from 20 yards.
But their hard work was undone moments later when Revell picked up a long ball, cut inside Mark Phillips a little too easily and lashed an effort into the top corner past a helpless Bull.
However, just minutes later Brentford were back in it.
A Saunders corner was headed in by MacDonald with the striker on his knees five yards out - although it looked as if it went straight through Lucas.
Brentford looked for an equaliser but couldn't create an opening and it took a brace of blocks by Bees skipper Alan Bennett from shots by McGovern and Billy Paynter to deny Swindon a fourth.
Brentford: Bull; Wilson, Bennett, Phillips, Dickson; Saunders, O'Connor, Bean, Wood (sub Weston 74 mins); MacDonald, Cort
Subs (not used): Price, Osborne, Foster, Legge, Taylor, Kabba
Bookings: Bean (83 mins) (fourth of season)
Swindon Town: Lucas; Amankwaah, Cuthbert, Greer, Kennedy; McGovern, Douglas, Ferry, McNamee (sub Timlin 79 mins); Revell (sub Paynter 85 mins), Hutchinson (sub Macklin 63 mins)
Subs(not used): Smith, Morrison, Lecsinel, Peacock
Bookings: Greer (35 mins), Macklin (67 mins), Timlin (83 mins)
Attendance: 6,471 (1,244 away fans)
By Chris Wickham