Sim, o Hybrid Sleep está provavelmente causando isso, veja o segundo FAQ . Desativar, girando a configuração para Off.
O que é o sono híbrido?
Hybrid sleep is another new power-saving feature designed primarily for desktop computers. Hybrid sleep saves any open documents and programs to memory and to your hard disk, and then puts your computer into a low-power state.
Unlike mobile PCs, desktop computers typically don't have battery-based power backup. So if a sudden power failure occurs to a desktop computer in standard sleep mode, data loss could occur.
But with hybrid sleep turned on, Windows can restore your work from your hard disk. On desktop computers, hybrid sleep is typically turned on by default.
When hybrid sleep is turned on, clicking Sleep automatically puts your computer into hybrid sleep. When hybrid sleep is turned off, or if your computer doesn't support hybrid sleep, clicking Sleep puts the computer to sleep.
Como o Hybrid Sleep se relaciona com o Hibernate?
Hybrid Sleep usa o Hibernate para salvar a memória em disco, mas não hiberna o computador.
Ele pode ser configurado para hibernar o computador após um certo tempo, o que não permite a hibernação manual ...
Para ativar ou desativar a suspensão híbrida:
Open Power Options by clicking the Start button, clicking Control Panel, clicking System and Maintenance, and then clicking Power Options.
On the Select a power plan page, click Change plan settings under the selected plan.
On the Change settings for the plan page, click Change advanced power settings.
On the Advanced settings tab, expand Sleep, expand Allow hybrid sleep, and then:
If you are using a mobile PC, click On battery or Plugged in (or both), click the arrow, and then click On/Off.
If you are using a desktop computer, click Setting, click the arrow, and then click On/Off.
Click OK, and then click Save changes.