post update

I was doing a few battles on auto and i was dying constantly wherein previously i had no problems with running through it. So i observed my character on auto, i was battling a wind boss, ofc i have my earth card equipped. So watching through i noticed that my unit AI is not using the earth card on my deck.. Whats worse is he just keeps spamming and spamming resistances of other elements wasting my actions, not only that but when my lines are full of earth orbs he uses it to as resistance! All those accumulated earth orbs that was supposed to be used for the ability wasted! I did a little more probing (after two more battles) still the same results.

Btw, the earth card is magus sisters on my thief deck

tl;dr Auto AI doing dumb things.

Edit:/u/ Alasur_ thanks. Apparently, all debuff cards eg (magus sister with slow) will not recast if ailment is already inflicted to the enemy. That's the new AI behavior.