Heimerdinger - H-28G Evolution Turret Bug (Never stops firing unless replaced)

Plopped two of these turrets in the bush right next to purple team's blue. Next thing I know a Lee Sin comes right up; in doing so the turrets begin to fire at enemy Lee Sin. However, one of the turrets never stopped firing even when:

• ... all enemies were not in range of turret, and
• ... turret went into "deactivated" state

When Lee Sin moved away from the range of the turret, it kept firing repeatedly (the rocket visual followed him even when Lee was hidden from the Fog of War) but appeared Lee took 0 damage from the turret.

Maybe one minute later, Lee Sin was slain. The turret stopped firing but resumed when Lee revived.

Lee Sin himself (as well as allies on my team) could see this happening as well. As a result, we could tell the general direction of where Lee Sin was at all times.

Edit: I have not been able to reproduce this bug yet (this has only happened to me once so far).