I have only had my Vive for a bit now. I have a VR ready Alienware laptop with a left and right USB port. I had always used the right without a problem. Today after a bios update (which might be unrelated), the left wand stops tracking. In the default 'apartment' setting both wands track and show fine. But when I launch a game the left want stops tracking and blinks in SteamVR. It works fine in the 2nd USB port but thats a bit inconvienent from the setup. Could it be a power issue? I'm not sure why it works in the apartment room but not a game. I've uninstalled and reinstalled SteamVR.