[Gameplay] Pantheon (W) Bug

When playing Pantheon almost every game I get a bug where I can't use my W at all, for a good 10 seconds, and it always seems to happen after I ult into a teamfight, so I'll ult and just be standing there doing nothing. I'm not exactly sure how to recreate this, but I've played like 20 games with Pantheon in a row(ish) and I've encountered this bug almost every game, and normally right after ulting.