Recently, my pc's been acting up. Or maybe it is my usb slots, I'm not sure. But sometimes, my plugged in USB units, stop working. They all just disconnect, and I have to restart my computer for them to work. It has happened 4 times so far. I thought it was my computers fault, so I did a complete reset, but nothing has changed. The problem still persists. Is it my USB ports that are not working or something else entirely?