Windows 10: "Sleep" is shutting down pc.

my pc used to "go to sleep" without any issue.
latly ive install my windows on protable ssd drive, and since then "Sleep" is shutting down pc.
the option "sleep" is visible but i acutually turning of pc.

what does this happen?
is it related to the fact the the system is intalled on external drive?

:)

 

PC not shutting down or sleeping

Hi Felipe,

There are some factors that we need to consider regarding your concern about the shutting down or sleeping in Windows 10. To properly diagnose this issue, we would like to know more about the issue by asking the following questions below:

• What is the last action taken before this issue happens?
• Any changes made to your hardware?
• Have you tried any troubleshooting steps?
• Have you also tried
  updating your drivers?

We also found a helpful response from Yashwanth Kotakuri on July 7, 2016 in this

thread. This will give you steps that resolve the same issue.

Let us know if there is anything else we can do to assist.

 

Shutting down, hibernating, or sleeping?

Speaking of ... I just built a new PC with an AMD Kaveri and Windows 7 64 and the option sleep is greyed out, I get shut down and hibernate; it's funny, on my PC (see specs) I get sleep and shut down not hibernate. I tried the bios but I'm clueless. Any ideas?

 

PC shuts down after trying to wake from sleep mode.

After my Win 10 PC goes into the sleep mode and I try to wake it, the PC just shuts itself down.
I have not tried much of anything to fix this. Any suggestions ?
Thanks