Guild Wars 2

When Im fighting a mob , and theres other mobs around, or even friendly NPCs around,
usually around 1/2 way thru the fight, the Mob thats targeted shifts by itself on to one of the other nearby mobs, or on to any of the friendly NPCs.
If there are friendly players around, sometimes they will end up my target.
I then have to frantically get the target back onto the original mob.
Im not pressing any of the targeting keys that change targets.
Does this type of thing happen to anyone else?

Same problem here! Also when fighting champions, I keep randomly selecting mobs and players. And I am not using the tab button, this is during fight.