Yasuo' ulti

Have anyone had issues with Yasuo's R today? I just came out of some rank games and almost threw the game because your Ulti will not come out and you don't gain the 150% Bonus Armor Penetration but the ability goes on cool down. The chances of this happening increases if you fail to do airblades/keyblades. This happened to me twice today in both games so i don't think it's just something random now