Sleep issue on windows 8.1: pc doesn't wake once it's in sleep mode

I just bought a new pc, an acer aspire E1-572G, and today I installed windows 8.1. But now I am having a problem that seems to be general, from what I am readind. The problem is with the sleep mode, which once activated, I can't return to windows, unless
I foce reboot. 
What can I do to solve this issue?
Thanks!

Hi,
Generally speaking, this problem should be caused by hardware driver problem. Such as Graphic driver, NIC driver, etc. Please check computer driver edition, make sure  they are compatibility with Windows 8.1.
Actually, I made a search on Acer official site, the model of your computer doesn't have all hardware driver provided for Windows 8.1. Such as Graphic driver. You can refer to the link below for more details.
http://us.acer.com/ac/en/US/content/drivers
In my opinion, it would be better to contact ACER, to check whether this serial computer had the same problem with yours. 
Roger Lu
TechNet Community Support

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