I just bought 2 stream 6000s, and one is making a weird vibration. If it touch it and move it, it'll go away for a minute but then come back, is the prop out of alignment or something? Its not a high pitch sound but rather a lower pitch that varies in pitch alittle. Not sure if this matters either but the one that doesnt make any noise is on a magnet mount and the vibrating one is on the standard mount.