Rodion15 :
Here's how I solved it: I still don't know why this fixed the problem. While looking at Disk Management, I found an 8GB "hibernation" partition, the same size of my RAM . I removed this partition with a third party application and the problem has dissapeared. My doubt is: if I had disabled hibernation as explained above. Why did it continue to hibernate solely because there existed a hibernate partition?. What created this partition?
Probably Intel Rapid Start if you have it installed. It's sort of a "battery benefits of hibernation with a resume time almost as fast as regular sleep" option that's available on newer Intel Core processors, and it requires a special hibernation partition equal in size to your physical RAM, on top of the regular hibernation file on your Windows partition, which at least on Windows 8 needs to stay as well if you want to continue using Fast Boot.
On a full SSD system, Rapid Start isn't terribly helpful since regular Windows hibernation is as fast or very nearly so (and doesn't require the extra partition), but on systems that have a spinning drive as primary along with a small SSD cache drive, it can make the hibernation entry and exit MUCH faster since it uses the SSD for those purposes rather than the spinning disk like Windows would. Additionally, if you want to use Intel Smart Connect and still be able to use some form of hibernation, Rapid Start is your only option since Smart Connect won't work while the system is in traditional Windows hibernation. Another perk of Rapid Start is that you can set it to hibernate ONLY after the system has been asleep for a certain period. I've never liked setting a regular hibernation timer because there are times I want my system to stay awake unattended even on battery (and I won't always remember to switch to a different power profile during those times), but if I put my system to sleep expecting to return quickly and don't, it would be nice to have an option for my system to transition to hibernation ONLY after it's already been asleep for a certain period of time. Rapid Start offers that, Windows by itself doesn't.
One drawback to Rapid Start (which the app warns you about if it detects this situation) is that if you're using full volume encryption, data written to the Rapid Start hibernation partition will NOT be encrypted, whereas if you were using regular Windows hibernation, it would be since the hibernation file lives inside the partition that's already encrypted.
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