Acer W3-810 Windows8 tablet is suddenly going to be Sleep mode

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http://superuser.com – I had set-up not to go to sleep mode. But, Acer W3-810 tablet is going to be sleep mode... I set all setting of sleep of in Control panel. After Idle timeout, system log 13:21:19 Kernel-Power The system is entering connected standby Reason: Idle Timeout. If you have any idea, would you please tell me? (HowTos)