Unkillable droidekas. After the update.

As I wrote earlier, droidekas get an extra turn when the commander droid has the Charged modifier active. If they survive the death of other B1s, they will fail the entire raid. And they can do this by getting an extra turn in the middle of the battle. Although I suggested prohibiting them from getting extra turns during a raid. 

https://forums.ea.com/discussions/swgoh-general-discussion-en/unkillable-droidekas/