Gul'dans Rain of Destruction Ult bugged (cancels almost always)

Hi there!
I am not very hopeful that this is still being monitored, but Gul’dans Ultimate Rain of Destruction is still pretty buggy.

It is almost impossible to cast without it being cancelled and going on a 10 sec CD:
Stand still: cancelled, move to where you want it a bit: cancelled, get an aura or heal from someone: cancelled. Minion in aa-rage: cancelled, take any kind of dmg: cancelled etc.
The last ARAM game I played today, I tried casting it on CD every time it was available for almost 20 times towards the end of the match, and it never worked.
It’s pretty unpredictable on when it will actually cast as intended, please take a look at this should you ever do another balance patch!