I main heimer too,and i experienced that error.Worst than that is the fact that from time to time the mega canon stop from hitting towers and/or inhibitors.It just stop to fire.It happens like about 1 out of 20 times.Another problem is that the litle canon have a stupid AI.Rather than hit the most lowest HP minions or hero they shoot stupidly to ,seems to be, random targets.This, need an impossible real time micomanagement of the canons.The worst problem ,if there had to be one....is the death recap,the total hp dmg never add up,so you never know what killed you or worst ...what to buy to save you as a consequence next time; i have seen case where the total dmg didnt even add up to the third of my hp before death.So the recap is COMPLETLY useless.
Finaly... i have reported those problems before....i mean years ago, and never got fixed thats sad.I have seen more less consequencials problems but im not sure to even write about it without the fear of losing more of my time to mention it.