Help or advise needed on multi-timers issue!

#include <GUIConstants.au3>
#Region ### START Koda GUI section ### Form=
GUICreate("Temporizadores", 150, 150, 438, 156)
$LabelTotal = GUICtrlCreateLabel("00:00", 8, 5, 40, 20)
$Button = GUICtrlCreateButton("Começar", 100, 0, 50, 20) ;  "text", left, top, width, height
$Button1 = GUICtrlCreateButton("Iniciar", 40, 26, 40, 20)
$Label1 = GUICtrlCreateLabel("0:06", 10, 30, 30, 17)
$tempo1 = 6 ; segundos
$Button2 = GUICtrlCreateButton("Iniciar", 40, 46, 40, 20)
$Label2 = GUICtrlCreateLabel("0:06", 10, 50, 30, 17)
$tempo2 = 5 ; segundos
 
GUISetState(@SW_SHOW)
 
$time=TimerInit()
While 1
    $msg = GUIGetMsg()
    $Total = TimerDiff ($time)
    GUICtrlSetData ($LabelTotal, $Total)
    Select
        Case $msg = $GUI_EVENT_CLOSE
            Exit
 
        Case $msg = $Button1
            contar1()
            $time=TimerInit()
        Case $msg = $Button2
            contar2()
            $time=TimerInit()
 
    EndSelect
WEnd
 
func contar1()
 
        While 1
            $new = TimerDiff ($time)
            If ($tempo1*1000)-$new <= 0 Then
                GUICtrlSetData ($Label1, "0:06")
                ExitLoop
            EndIf
            $new = ($tempo1*1000)-$new
            $seconds = Round ($new/1000)
            $newMin = Floor ($seconds/60)
            $newSec = Mod ($seconds, 60)
            If $newSec < 10 Then $newSec = "0"&$newSec
            GUICtrlSetData ($Label1, $newMin&":"&$newSec)
            Sleep(400)
        Wend
EndFunc
func contar2()
 
        While 1
            $new = TimerDiff ($time)
            If ($tempo1*1000)-$new <= 0 Then
                GUICtrlSetData ($Label2, "0:06")
                ExitLoop
            EndIf
            $new = ($tempo1*1000)-$new
            $seconds = Round ($new/1000)
            $newMin = Floor ($seconds/60)
            $newSec = Mod ($seconds, 60)
            If $newSec < 10 Then $newSec = "0"&$newSec
            GUICtrlSetData ($Label2, $newMin&":"&$newSec)
            Sleep(400)
        Wend
 
EndFunc