Hi beenie,
About sleep problem...
Intel said have a problem with CPU....
But he exist a new bios:
download.gigabyte.asia/FileList/BIOS/mb_bios_ga-z87m-d3h_f7d.exe
How to flash a bios:
Use this utilities:
download.gigabyte.eu/FileList/Utility/mb_utility_atbios_8series.exe
Disabled Keep Data Info when you flash a bios, during a procedure.... specialy if you use QFlash ....
After Flash a bios, Reboot, return in bios and choose Load Optimize Defaults....
accept a change, reboot....
RE EDIT:Your problem arrive when you use USB device to wake up from S5, PS/2 only
Or on the same time, with a wake on Lan?
What are settings for bios about WOL and wake up by S5.... ?