I have not been able to fine out why My master switch goes off on decent which in turn turns off autopilot. I have reinstall fS9 fresh. Tried a default flight no problem. When I install an addon back to auto pilot and master swith turning off on its own when ATC gives me an instruction to decent. It also does it on the defaults now to.If I don't install addons everthing works fine. I am using the fs2004 addons from this sight and from Avism for example The 737-400 with crew announcements. The 777 made for the meljet. Then When ATC gives me a decent order then the autopilot and master switch goes off autmatically while decenting. Any help on this would be appreciated. I believe it could be a gauage but not sure. Can't seem to fine anything. Please help. Generators are on also but go off when master switch goes off.