I've for about a year intermittently lost one or the other of my USB ports for no reason I can discern. In the last 48 hours I'm now losing multiple ports at the same time. These ports are inside the computer so not a hub issue. I am using Win 7 64 bit and I suppose it could be software related. Its an i5 processor. What would anyone suggest might be a way to sort the origins of the problem out?