I'm running a Launcher Dealer, and I've noticed she'll occasionally stop using her autoattack and just stand there letting enemies attack her without fighting back. All her ability attacks work, which isn't much help when they're on cooldown. It only seems to happen right after she's used an ability, after which point she stops using her autoattack no matter how much I spam the autoattack button.
Her current equipment is a crude launcher loaded with Iron Shells, not sure if that will make a difference.