Okay, I just purchased 4 new XPS 8900 computers. From day 1, I have been having issues with USB 3 ports. I first had then in the back when I had a mouse and keyboard plugged into the USB 3, and then 2 external USB 8 gig drives. As I would try to transfer data back and forth between the drives, the port would disconnect connect and my transfer would stop. I thought I had a bad disc so exchanged it. I am now trying to transfer data between external USB 3 discs with my front USB 3 ports. I plug them in and the computer does not see them. I plug into the top usb 2 and no issues. Somehow after playing around I get the front USB 3 ports to see the external drives and start a transfer. I again get the disconnect issue.
So I have read thread on the xps 8700 have this issue and never being solved. We purchased 4 of these 8900's but unless I get a good answer as to the root cause and fix, I am leaning towards returning them all and finding another mfg to buy my computers from.