autoit image mouse doesn't want to move

My problem is sometimes mouse not move on click on object target.

#include <ImageSearch.au3>

HotKeySet("{F7}", "Start")
HotKeySet("{ESC}","Stop")

$X = 0
$Y = 0
$X1 = 0
$Y1 = 0
$X2 = 0
$Y2 = 0
$X3 = 0
$Y3 = 0

Func Start()
    While 1
        $result = _imagesearch("kage.bmp", 1, $x, $y, 10)
        If $result = 1 Then
           Sleep (300)
           MouseClick("left", $x, $y)
           Sleep (12000)
        EndIf
        $result1 = _imagesearch("kage1.bmp", 1, $x1, $y1, 10)
        If $result1 = 1 Then
           Sleep (300)
           MouseClick("left", $x1, $y1)
           Sleep (3000)
        EndIf
        $result2 = _imagesearch("kage2.bmp", 1, $x2, $y2, 10)
        If $result2 = 1 Then
           MouseClick("left", $x2, $y2)
           Sleep (8000)
        EndIf
        $result3 = _imagesearch("kage3.bmp", 1, $x3, $y3, 10)
        If $result3 = 1 Then
           MouseClick("left", $x3, $y3)
           Sleep 200
           MouseClick("left", $x3, $y3)
           Sleep (12000)
        EndIf
     WEnd
EndFunc

Func Stop()
    Exit
EndFunc

While 1
    Sleep(200)
WEnd