Sherman Hill - consists uncouple at random

Hi all -
I'm wondering if any of you have (or have had) consists randomly just uncouple on the Sherman Hill route. The only time they stay connected is when I first begin to move. If I stop, then start up, the consist uncouples probably half the time. Sometimes the cars will also uncouple while in steady smooth motion. I first thought it was doing it with only the add-on cars that came with Sherman Hill, but it does it with any and all.
I duplicated the entire consist and ran them in different routes (Cajon, Castle Rock) and the uncoupling does not happen. I also tried setting options to auto couple or manual. Makes no difference.
Can anyone help? I'm stumped.
I'm wondering if any of you have (or have had) consists randomly just uncouple on the Sherman Hill route. The only time they stay connected is when I first begin to move. If I stop, then start up, the consist uncouples probably half the time. Sometimes the cars will also uncouple while in steady smooth motion. I first thought it was doing it with only the add-on cars that came with Sherman Hill, but it does it with any and all.
I duplicated the entire consist and ran them in different routes (Cajon, Castle Rock) and the uncoupling does not happen. I also tried setting options to auto couple or manual. Makes no difference.
Can anyone help? I'm stumped.