Some os the FMS downloads are unstable, why???
 

I downloaded an AURUM 30 sports, (pattern) plane and it does crazy things. It is too twitchy, unstable, and when doing rolls, which are pretty quick, the FMS locks up and I must restart the program. It is not like any other plane in the program, and dont cha know, its the one I really fly with at the field. Is this correctable? How? Thanks again to everyone for all the help offerred in the past. This site is a wonderful thing!