I think I have the same problem. I have a very small room with inclined ceiling so there is no perfect way to put the lighthouses and I use VR only sitting in my chair and mostly without the controllers. One lighthouse is 1m infront of me, the other one to the rear right about 2m away. There is also a window in this room which I tried to cover with a bedsheet to reduce reflections but that didn't do a thing. The picture is constantly jittering a tiny bit but it's really distracting. I don't think this is a USB issue. I am surprised not more people have this issue.