I bought a Hubsan x4 H107 mini quad and was quite please with the results. In a couple of days I had it hovering and maneuvering all over my house and in and around objects. However, it is now uncontrollable. It tilts left and right and back and forth and won't behave. I have changed props, recalibrated the controller, checked to see that the blades are clear, tried trimming and don't know what else to do. Maybe I have a bad motor, but which one? They all work. Or maybe the board is going out, or getting a weak signal? Anyone else experience this? I also have another drone that I fly regularly and have never experienced this issue.