Have an issue with the Yoke that's now 5 months old, during normal flight in clear conditions, ( Twin engine Islander @ 3,500 ft ) no wind dialed in to speak of, the airplane will bank abruptly to the left and its everything I have to get it back to level flight. This may happen several times in a row before things settle down. On occasion if I'm trimming for pitch the a/c will also flicker like it wants to lift a wing. I can fly for what seems like hours without an issue and then "bam" out of no where were fighting to keep the plane level in flight #$%&* Anybody ?