After the most resent firmware update I have began experiencing that it will no longer sleep. When I close the cover it always hibernates. Upon further investigation within the power management menus I discovered that the "sleep" option has disappeared completely. It only shows "Do nothing, Hibernate, Shutdown". The sleep option is what it shows initially, but upon clicking on the dropdown under Lid close action -> on battery, sleep disappears and I only have the above 3 options.