Case study:
You select a target, or auto-aim does it for you, BUT, the target moves away from you, AND ultimately, out of your weapon's range.
The aim should disengage once the target moves out of the weapon range, but such is not the case. The aim holds on for a while. You CAN fire, you just aren't dealing damage. All the while, closer mob is dealing damage to YOU.
This should be corrected.

I posted something along these lines in a previous auto-aim thread, but didn't mention the part I just wrote about.