I've noticed a few times now the game will skip Willow's turn in combat. This has happened 2 times for me ( iOS version ). I believe both occurrences were using the auto feature ( the second for sure ) and turning it off during the boss load animation.
In-game Player Level: 61
In-game Name: codejedi
Champion: Ella Ametryst ( 60 ) ( * * * * * * )