[Gameplay] Vi's Q vault breaker stops working (possible fix in post)

I am having the same problem as a few other people in which Vi's Q stops working. I was using officer Vi skin and maxed my q all of a sudden it stopped working when i first encountered this.

here are some situations I and my friends managed to get the issue to pop up:

• maxing q while charging it seems to have broken it.
• dying while charging q also seems to trigger this bug.
• getting stunned or snared or knocked up while charging seems to also trigger this.
• Buying a two pots in succession at 18 managed to get q to break once but haven't been able to get it to do that again.
• triggering q before its fully charged occasionally also breaks it but I never managed to get it to do that but my friend did.

My friend managed to fix his q by self casting it, but it occasionally doesn't work. I read here that exiting mid game and relogging back fixes the issue as well.

hope this helps.