Several times now I have encountered a minor error of mystical frustration that sends me whizzing out to the login screen after a good minute or so of deadly laggedness. On rare occasion, this results in a situation where, when logging back in, the amount of resources available to use are approximately half of what they should be. So, whenever you crash I highly suggest avoiding the problematic fights until you know if you are bugged.
In order to know if you are bugged, keep a general rundown of how many abilities you can use before exhausted. Try a fight that would normally be very easy, and see how drained you are feeling. If you have far less ability to continue fighting than you would expect, conjure forth the mystic control panel and log thyself out! Upon logging back in, you should find your full abilities restored, and be able to fight with your normal vigor!