I have a USB hub that can be powered but didn't come with a Power cord, so I don't use one. I have 2 Steering Wheels plugged into it (G27, Force Pro, both powered on their own), Keyboard (Logitech Wave), and my Phone Charger (rarely used), but occasionally I get a strange issue. My Wheels will randomly re-calibrate themselves when nothing has happened power/software/hardware wise, and I was wondering if it could be due to having too much on the Hub without power, or just plain out too much on the hub?