As someone who's played 10 games with ekko in ranked

His ult feels glitchy at times. I press it but nothing happens and I die. Once I ulted and like a split second before I got invulnerability I died mid ult. Also, when I get cced, I spam ult so fast that I expect to ult as soon as the cc is over, like a split second after I expect my character to ult, but nothing happens. I don't know if it's just me it doesn't feel as smooth as it should be.