Client Crashes

Very often when opening hextech crafting my client crashes and exits A few times in the last couple weeks my client has crashed during champ select in 5v5 normal draft (thankfully not in ranked draft) Probably a third of the time my client has crashed going to the post screen lobby resulting in me missing a couple lvl 6 mastery tokens and chests. I have tried reinstalling the game, I'm not sure what to try from here. Any help would be greatly appreciated.