Strange coupling/uncoupling behaviour

Apologies if this behaviour has already been reported.
Playing a scenario on Cajon Pass called Full Up. Nearly at my first drop off point when 2/3 of consist just uncouples. Reverse back slowly to try to recover it. As I get about a wagon length away the broken part of the consist accelerates toward me like a rocket derailing the whole consist.
Playing a scenario on Cajon Pass called Full Up. Nearly at my first drop off point when 2/3 of consist just uncouples. Reverse back slowly to try to recover it. As I get about a wagon length away the broken part of the consist accelerates toward me like a rocket derailing the whole consist.