Ezreal bug

i don't know if this is happening for everyone but whenever i play ezreal around lvl 6 (i don't know if there's a correlation) my client closes and i get a pop up leading me to riot support. The pop up says ezreal. i thought it was a bug with my computer till it happened in a ranked match and i read what it said (costing me one of my placement matches) Also when i try to open the launcher the play button becomes black and white and my server says unavailable