Ok I added this as a comment to someone else's post, but seeing as how I literally came here to post about this, I might as well give it its own discussion as well.
I've been seeing some bugs with Heimer's ult turret for some time now, and often in different forms. But for sure, the donger's in need of some investigating.
Sometimes, his ult turret will fire at an enemy out of its range and out of the fight, but only visually, it actually does no damage to anyone. I've seen this numerous times; sometimes it happens when someone starts in range of the turret and leaves (once they leave it does no damage to them, but they draw fire that could be focused on enemies that could/should actually be getting damage from it). Sometimes I just see the turret freak out and not fire at anyone at first, then shoot at like the jungler who crossed mid lane a while ago.
I've also seen a lot of times when I lay the ult turret down in a teamfight, and it gets maybe a couple shots off, but then stops firing, before it runs out of time or health - just standing there doing nothing. The thing is its not lag or just a visual delay, but I actually watch it do it's little humming-jumping thing it does while active but not firing, while there are enemies in its range. I see this more often than the former, and its equally frustrating. I'm really just hoping you guys can take a look and hopefully find/squash this nasty little bug, cause the donger was my favorite champion to play when I first started, and is still a blast when picked into the right comp.
He's a really fun champ to play, it just sucks, given how squishy (and occasionally weak late game, if not really fed) he is, that sometimes his kit doesn't work like it's supposed to. delthebear (NA) - 30 minutes ago