Heimerdinger bugs

I'm a Heimerdinger main and I've noticed a bug that seems to be happening more and more frequently with his turrets. The turrets will a lot of times sit idle after casting in spite of being in range to attack multiple targets. This is especially frustrating when the ultimate turret doesn't attack. The bug is most easy to replicate on enemy inhibitors. Another bug I've noticed, which doesn't really effect game-play, is where the turret will have infinite range and be shooting toward the last opponent that was in range until visibility is lost, then it'll keep shooting at the place where visibility was lost until that opponent comes back in visibility no matter how far away they are, but it won't do any damage. This will most often times happen when an opponent flashes away as soon as the turret is cast.