So here's a weird one. Both Paladin and Barbarian topped 2000 speed (the first I noticed it anyway) and then the attack cycle stopped. Had 3 members (for the entire post-dragon levels) until the final boss battle when they woke up again.
Viewing post in Items of Power (Incremental Auto-Battler) comments
That...is a weird one. I'll be sure to look into it. Thanks for letting me know! Do you know if you had any amulets or books? Just thinking of which items would be most likely to bug into that sort of state.
Edit: I think I figured it out. I'll fix it in the next update. For anyone else dealing with this issue, I think using a book to reset their ability will fix this issue. Sorry for the inconvenience!