I don't think it is anything to do with any updates you may have done,,, press and release the green power button,,, it will bring up the windows shutdown caption,,,, check that it is set to hibernate,,,, also go into power option properties and ensure enable hibernation is checked,,
also power option properties,, go to advanced settings and check that closing the lid will allow hibernation,,,
anything else give me a shout,,, fellow T1XP user