Heimerdinger's turrets

Occasionally, heimerdinger's turrets will not fire at obvious targets such as turrets champions and even the minions even though they are well inside the turret's range of fire. Usually the turrets will recover if the laser is fully charged or after firing the laser. The same issue will occur with heim's super turret as well, turning all into targetable ornaments. The error usually occurs when placing a turret so that it will attack a lane turret, and it does happen <10% of games. Also if multiple opponents attack the turret (ex. minion line), the turret will sit there switching targets, but not firing. I think this is simply an issue of the turret being overwhelmed and not a bug.