Crashes, drives disappearing, no bootable device

Specs:
GIGABYTE GA-Z77X-UD3H rev 1.0
Intel i5 3570K @ stock
GIGABYTE Geforce 670 Windforce 2gb @ stock
Seasonic M12II 520 Watt Bronze
2x G.SKILL Ripjaws X 4GB 1600 @ stock
2x G.SKILL Ares 4GB 1600 @ stock
Win 10 x64 Pro
Win 7 x64 Ultimate
Mushkin Enhanced Chronos 120GB MKNSSDCR120GB
Samsung 850 EVO 500GB
Seagate ST1000DM003 1TB
Hitachi Ultrastar HUA723020ALA641 2TB

MINIDUMPS HERE:
https://puu.sh/rn5qY/deb81a44fb.zip

So I've been having issues with my computer ever since I did the upgrade to Win10. After upgrading, I never received my entitlement, and system was slow and unresponsive, had constant crashes and drives disappearing. I also reseated my cpu cooler and updated my bios from F18 to F20e at the time (since reverted).

I've tried:
-Clean install of W10, fixed most of my instability issues. This led me to discover that my USB 3.0 ports are malfunctioning; will freeze for a second or two every few minutes.
-drives continue to disappear after several hours. no clear pattern, sometimes will BSOD immediately after boot
-resuming from sleep only seems to aggravate issues. have stopped sleeping

-reverted overclock on cpu
-installed modded intel usb 3.0 drivers from WIN-RAID, has fixed issue for intel ports only (via modded drivers do not fix the issue). gigabyte website does not have up-to-date drivers for my board
-ran memtest86 to completion, no errors
-bought new hard drives (samsung and hitachi), cloned windows 10 to samsung from mushkin drive, installed win 7 onto mushkin drive. issues persist with gigabyte win7 drivers)
- swapped sata cables around. NOTE: did not purchase brand new cables, only swapped them from within same system
-reseated ram (have not tried running with only one DIMM at a time)
-reverted bios from f20e to f18

ran with driver verifier, had one bsod related to atheros lan driver?
Attachment 103088

Interesting to note is that the sata drives are not bootable at the time of crash. Restart leads to no boot device. However, simply waiting a few hours resolves the issue until the next crash.

Could be temp related? Cpu temps are fine though, under 55c load

Attachment 104577

Hey, thanks for the reply.

No worries, I am also rather busy, take your time. Thanks for helping me out!

The L1C63x64.sys driver is I believe related to the Atheros 8151 GigE LAN driver. Unfortunately, I don't think there are any versions much newer than that (the absolute latest one I can find is for win8 dated august 2013...I can try installing that one.

Unfortunately don't think that solved it. Got another BSoD, no dump either since it couldn't find a drive to dump to. =|

I've now swapped the drive off of the SATA 6Gbps port to a 3Gbps port, seeing if the port is an issue. Fingers crossed.