My game crashes when I join a server

[Diamond_Block]

Hello, I recently went to prestige rewards and got myself a new custom class slot, and little did I know that it would break the game for me. I tried reinstalling the game, it worked fine for the first day and now every time I join a server, I either play with 6 fps or the game just crashes. Zombies works just fine, it's just multiplayer that got completely obliterated

[HannesC]

Corrupted stats. Type resetstats into the console and don't unlock an extra class slot

[Diamond_Block]

Ok, thank you so much