Not long ago I bought a cheap little USB 3.0 card for my Mac Pro, which seemed to work fine. After a while though, I noticed the Mac would restart by itself with no warning and got KPs every time I wanted to connect more than one usb 3.0 device - for instance, one external HD + another HD + a blu-ray drive. With just one HD I don't have KPs. That's the card in question: http://www.sybausa.com/index.php?route=product/product&product_id=231 ...2 days ago I removed it and now everything's back to normal. Obviously something's wrong between the computer and the card, I just wonder what is wrong. Any idea(s)?