I've had this problem before after converting my p1.1.1 to 1.5. My drone is drifting after yawing. Either direction it will move to the right and then drift back to where I first yawed. I had it happen before but don't know how, so what I am asking is, does anyone know what I can do to fix this drifting issue? It isn't doing the toilet bowl effect just a yaw drift and sometimes it will keep on drifting while in gps mode! THATS AWFUL haha. Some things I can think of is taking the top part off and making sure the naza is level using a bullseye bubble measure. or pieces of paper to lift one side of the drone that may be uneven? Thanks for the help in advance.