Random USB disconnect and freezing on shutdown

I've been having a really nagging problem with my comp lately and I have essentially run out of ideas on what is wrong with it.

I've been running the PC for almost four months now, but it started to have problems a few weeks (and seems to be getting more consistant in problematic freezing/hanging).

What started happening was that my USB devices would all disconnect at once (as if they lost all power); I initially tried to just unplug and replug them back in, but nothing changed so I would have to shutdown using the keyboard which still worked (PS/2 connection). However, when I would set the comp to shutdown it would proceed normally, but the screen will sit on the "shut-down" screen and just basically hang there until I did a hard-reset with the button on the computer case (bringing me to the start windows in safe/normal/etc mode)...

I have a Logitech USB mouse and an Xbox360 gamepad plugged into two of my USB ports.

I've only gotten one BSOD randomly which gave me the 'BUGCODE_USB_DRIVER' code, but after rebooting all of my drivers appear to be up-to-date (no Yellow icons for hardware (none show in hidden items either).

I've scanned for virus'/malware, turned off the USB disable option in Windows, CCleaner, updated MOBO Bios, verifier.exe, tried to record all mini-dumps (but don't help much with no BSOD), been running 'whocrashed', run MEMTEST with 3 successful passes, operating temps have been nowhere near hot (GPU~40*c, CPU~30*c), Prime95 reports no issues, etc when the computer fails - it seems to fail for no reason (It doesn't mess up with any particular program, just whenever it feels like it).

The issue is compounded by the fact that I never get a BSOD, so being able to track what is causing the USB discconect/comp freeze has me completely baffled and out of ideas.

I'm leaning towards the MOBO chitting out on me, but at this point I have no clue at all what is wrong. Is there anything that I can do to help you guys pinpoint what is causing the issue?

Thanks much in advance
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  1. Here is the build:

    OS:
    Windows 7 64 Home Premium

    MOBO:
    GIGABYTE GA-P67A-UD4-B3 LGA 1155 Intel P67 SATA 6Gb/s USB 3.0 ATX Intel Motherboard

    CPU:
    Intel Core i7-2600K Sandy Bridge 3.4GHz (3.8GHz Turbo Boost) 4 x 256KB L2 Cache 8MB L3 Cache LGA 1155 95W Quad-Core Desktop Processor

    PSU:
    Cooler Master Silent PRO GOLD 1000W

    RAM:
    G. KILL Ripjaws X Series 8GB (2 x 4GB) 240-Pin DDR3 SDRAM DDR3 1600 (PC3 12800)

    GPU:
    EVGA GTX580

    SSD (OS and select programs/games):
    Crucial RealSSD C300 CTFDDAC064MAG-1G1 2.5" 64GB SATA III MLC

    HDD (music/photo/etc storage):
    Western Digital Caviar Black WD1002FAEX 1TB 7200 RPM 64MB Cache SATA 6.0Gb/s

    DVD:
    ASUS Black 24X DVD+R 2MB Cache SATA 24X DVD Burner

    CPU Cooler:
    COOLER MASTER Hyper 212 Plus

    Mouse:
    Logitech MX518
    &
    Xbox360 wired controller
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