I had the same problem. As makinaz posted in the game's main thread:
Never got a single lockup after I stopped using 2x attack. I admit it's really dumb being forced not to use a skill that is in the game but I think there aren't any workarounds.
Attack all enemies speed skill was also reported to be a problem. This game has been busted for weeks now, I don't have much faith it will be fixed. If you're not too far in the game or financially invested I'd turn away, it's just not worth it.