My usb jacks are disconnecting randomly and then after a reboot they work again

It started yesterday, they'll disconnect everything plugged into them then after a reboot they'll be working again, at least for a while.
I don't remember having installed anything yesterday.

What could it be?

My rig:

OS: Windows 7 64 Ultimate
Monitor: LG Led 20EN33
CPU: AMD FX 6300
Video: GTX 750 1GB
HD: WD 500GB 5400 Rpm + Samsung 1TB SATA II 7200rpm + 2TB Seagate + SSD Kingston 240GB
Motherboard: Gigabyte GA-LMT78-S2
PSU: 500 Watts
Reply to Rafael Mestdag
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