printdefault not working somtimes in internet explorer.

[iamtech]

i tried to print ie windows with cutepdf writer/pdfelemnet using

_IEAction ($oIE, "printdefault")

but it was not working sometimes, autoit icon showing in tray but not printing anything.

My full code is : 

#include <IE.au3>
#include <MsgBoxConstants.au3>

Opt("TrayAutoPause",0)
HotKeySet("{ESC}", "Quit")

Func Quit()
    Exit
 EndFunc
$oIE = _IEAttach ("Gujarat PDS Shop")
_IELoadWait($oIE)
$body = _IEBodyReadHTML($oIE)
If StringInStr($body, "Bill Details) Then
$Dbillreceiptdetails = _IEGetObjById($oIE, "billreceiptdetails")
$Dbillreceiptdetails.RemoveNode(True)
$DitemgridDetails = _IEGetObjById($oIE, "itemgridDetails")
$DitemgridDetails.RemoveNode(True)
_IEAction ($oIE, "printdefault")
_IEAction(_IEGetObjById($oIE,"lnkbill"),"click")
WinWait("Select a filename to write into")
WinActivate("Select a filename to write into")
endif