Might be a coincident, but.... after upgrading to this version I experienced connection problems between the GO 4 app and my Android (Samsung S6) via the supplied short cable on the left hand side. The connection became unstable, suddenly disconnecting and reconnecting. I'm happy it occured already during warmup before takeoff. Troubleshooting concluded the short cable to be at fault, as connection through the center connector on the RC proved to be stable. Later today I found a post on this site explaining that it is a know issue connecting Android phones by the side cable connector. But I have not experienced this error before (although being a newbee with brief experience); for me the problem first surfaced after upgrading from .500 to .550 version. As stated in the beginning, it just might be a coincident, but I thought I should share.