Despite one of previous patches was suppoed to fix this, it still does reset during operation when scoundrels steath to throw a Shoot First. Apart from this, working great
I just logged on and tested this via my scoundrel and the ship dummy. The issue your scoundrels are seeing is most likely that their dot ticks while they are out of combat from the stealth Disappearing act. This tick throws an enter combat event, then another exit combat event occurs which resets the fight. I will look into a fix.