It was a difficult day at the office for Southend United who were beaten 4-1 at home by AFC Wimbledon.
Marcus Forss bagged a hat-trick for the Dons, two coming in the opening 11 minutes, as he continued his fine form in the league this season which takes his own tally to seven.
Blues welcomed Timothee Dieng back into the starting line-up for the first time in Sky Bet League One, and he reduced the arrears in the opening 45 minutes with his first goal of the season to send Blues into half-time with just the one-goal deficit.
But after the break Forss completed his hat-trick from the penalty spot and Ryan Delaney added a fourth from a corner as he headed past Mark Oxley to hand the Dons three points.
Gary Waddock was able to name Tom Hopper on the bench for the first time since he ruptured his ACL last season against Walsall at Roots Hall.
In the starting eleven itself there were four changes from the side that lost to Gillingham last weekend. In came Nathan Ralph, Joe Shaughnessy, Brandon Goodship and Dieng for Mark Milligan, Jason Demetriou, Stephen Humphrys and Isaac Hutchinson.
The Dons went into the game just one place above Blues towards the foot of the League One standings and they started quickly as Joe Pigott sent a deflected shot wide of the left post.
But the visitors soon raced into a two-goal lead as Forss, on loan from Brentford, found the net on two occasions just over five minutes apart.
His first came after he burst into the right hand side of the penalty area, with his shot deflecting in beyond Oxley.
Six minutes later, Forss had his second, reacting sharply following a goalmouth scramble, which included a fine save from Mark Oxley, before firing home from eight yards.
However, Gary Waddock’s side replied just two minutes later when Nathan Ralph delivered a fine left wing cross which Timothee Dieng headed into the bottom right hand corner of the net from six yards.
Moments later, Blues were forced into making their first change of the afternoon as Harry Lennon went off injured and was replaced by Isaac Hutchinson in a move which saw Rob Kiernan move back into the defence.
Southend remained on the front foot with Elvis Bwomono having a 20 yard shot tipped wide of the right post by Dons goalkeeper Nathan Trott before Simon Cox headed over a right wing cross from Bwomono.
AFC Wimbledon replied with Mitch Pinnock – a former Blues winger - volleying over from 12 yards before the hosts hit back with Rob Kiernan volleying straight at Trott following a left wing corner from Brandon Goodship.
Blues’ spell of pressure did not bring an equaliser and Wimbledon took full advantage by extending their lead seven minutes into the second half, with Forss completing his hat-trick.
The striker’s third goal of the afternoon came from the penalty spot after referee Simon Hooper penalised Kiernan for a push on Ryan Delaney as he attempted to reach a right wing corner from Pinnock.
And Forss made of the most of the opportunity as he impressively slammed his penalty into the top right hand corner of the net.
Blues responded by making a second change in the 71st minute as the fit-again Tom Hopper ended close to a year long spell on the sidelines with a cruciate ligament injury by replacing Nathan Ralph.
However, the visitors remained on top with Pigott having a close range effort tipped wide of the left post by Oxley.
But, from the resulting Max Sanders corner, the visitors made it 4-1 with Ryan Delaney rising high to nod home a powerful header.
Blues soon made a third change with Jason Demetriou replacing Elvis Bwomono at right-back but it was the visitors who continued to threaten with Oxley doing well to keep out Kwesi Appiah’s close range header.
Blues XI: Oxley, Bwomono (Demetriou 78’), Ralph (Hopper 71), Dieng, Cox (C), McLaughlin, Goodship, Kiernan, Hamilton, Shaughnessy, Lennon (Hutchinson 18’).
Subs Not Used: Bishop, Taylor, Egbri, Rush.
AFC Wimbledon XI: Trott, Thomas, Wagstaff (C), Pinnock (McLoughlin 90’), Forss (Appiah 78’), Delaney, Sanders, Kalambayi, Osew, Pigott, Wordsworth (Hartigan 82’).
Subs Not Used: Tzanev, Stabana, Guiness-Walker, Reilly.
Referee: Simon Hooper
Assistants: Daniel Robathan & Neil Davies
Fourth Official: Alan Dale
Southend United: Dieng 13’
AFC Wimbledon: Forss 5’, 11’, 52’, Delaney 72’
Attendance: 6,420 (666 Away Fans)