Yup, having the same exact issue here, displays, controls freeze and the plane veers off course. Seems a lot of people are encountering this issue. I had no idea it could be connected to the navdata although now that I think about it it seems that the first flight I do when I have forgotten to update navdata it has worked, but when I do after a certain amount of minutes or hours into the flight displays, instruments and controls freeze and the plane veers off course and cannot be controlled.