The Hawks dropped into the Blue Square Bet South relegation zone as they slumped to a 3-2 defeat against Basingstoke Town at the Camrose.
A poor first half left the Hawks trailing 2-0, before an embarrassing mistake from goalkeeper Lyall Beazley saw the home side extend their lead in the second half.
Christian Nanetti pulled a goal back with a superb strike but it was too little too late for the Hawks – despite Ollie Palmer’s last-gasp effort.
An inspired Gosport Borough produced a tremendous performance and deservedly won 2-1 at Hungerford Town in the Southern League division one south & west.
Brett Poate and Dan Wooden were on the mark either side of half-time for Alex Pike’s promotion chasers as kept the pressure on the teams above them in the table.
There was no such luck for Bognor, though, who let slip a two-goal lead and their place at the top of the Ryman League division one south table after their 3-3 draw with Crawley Down.
Terry Dodd and Dan Johnson looked to have given the Rocks yet another valuable three points.
But three second-half goals in quick succession gave Crawley the advantage, leaving Johnson to strike again in stoppage time to salvage a point for Bognor.
In the Wessex League premier division, goals from Chamel Fenelon, Gary Austin and Brian McKie gave 10-man Horndean a 3-1 win over Blackfield & Langley to ease their relegation fears.
Fenelon was sent off late in the sent half.
Meanwhile, Fareham suffered a 2-0 defeat at the hands of Christchurch.