Problem with Auto-Sleep

[Varvoke]

Recently I cam back from a weekend away, and after using my computer, I let it auto turn off the displays to save power (as I always do).  When I tried to wake it, the computer froze, played the disconnect sound, and the keyboard backlight pattern froze.  After a few minutes, the computer started regularly, but with one or two of the monitors powered down, and notifications showing that several applications having crashed.  I can fix the monitor problem by simply power cycling them, but this problem has become irritating.  I built the computer a year and a half ago with a GTX 750 ti and 3 months ago upgraded to the 1070.

 

Also, before posting, the system occasionally gets stuck on post codes A2 and 71.  If I retry the post, it usually works perfectly.  Finally, (this has only happened once) the computer put itself into a full sleep, and when I went to wake it it fully restarted.  

 

System:

OS-Windows 10

CPU-i5-4590 (upgrading soon to 7600k)

Mobo-MSI Gaming 5 z97

Ram-16gb DDR3

GPU-MSI Gaming X 8g GTX 1070

SSD-Samsung 500gb

HDD-2x 500gb 7.2k

PSU- Corsair RM750i

Case- Corsair 570x RGB

Keyboard- Corsair k95