In X-Plane when flying between way-points in auto mode and after about 20 minutes the autopilot automatically switches into stabilize mode. Any ideas or suggestions on how I might correct this and if this is something to do with X-Plane and not something to be expected in a real world scenario?
Do you have the free or paid version of X-Plane? The free one has a timeout, as I recall.
I have the paid version. Another thing is that on the transmitter I have only two modes (manual and stabilize). When flying in auto mode I turn off the transmitter to save battery. When the transmitter is turned off the autopilot goes into stabilize mode automatically which is expected. From the apm I then change modes to auto and the plane starts to fly the designated flight plan, but it is after about 20 minutes that it switches to stabilize mode. I am pretty certain it has something to do with the mode being set to stabilize on the controller and the transmitter being off, but I can't figure it out.