Since Patch 1.16, the up and down arrow keys are now used for two different things:

1.) To change targeting modes outside of combat.
2.) To switch between the three action bars inside of combat.

Quite often, for a reason unknown to me, the game decides I'm not in combat when I actually am, and pressing the arrow keys to switch between my action bars ends up actually changing my targeting mode. This cancels my current target, which is a problem when I'm in the middle of a fight.

Anyone else using the keyboard to switch action bars having this problem?