UFT not identifying a window in some playback

UFT not identifying a window in some playback

I am using descriptive programming in UFT. During playback, I want to
check if the Windows print dialog does appear. Then I want to click the
Cancel button in that dialog. My problem: Sporadically QTP fails to
identify the printing dialog, so clicking on the cancel button fails. How
can this possibly sometimes fail, sometimes succeed?
My code syntax given below:- Set Window_EnterMeter =
browser_servicemanager.Window("regexpwndtitle:=Enter Meters.*") Set
dialog_Print = Window_EnterMeter.Dialog("regexpwndtitle:=Print") Set
winbtn_CalcelPrint = dialog_Print.WinButton("regexpwndtitle:=Cancel")
fn chckprintpopupwndow() { ''''''''Navigating to that page call
Absolutehighlight(Button_Action) call Absolutehighlight(Meter_Entry) call
Absolutehighlight(PrintMeter_Opt2) AbsoluteClick(PrintMeter_Opt2)
EnterMeters_Window.WebElement("html id:=ctl00_Save_BTN_C").Click
'''''''By click on abve option window popup print option appears and UFT
not identifying that window all times, so clicking on cancel button not
doing so TC fails dialog_Print.Activate AbsoluteClick(winbtn_CalcelPrint)
EnterMeters_Window.WebElement("html id:=ctl00_Cancel_BTN_C").Click }