Unknown Error Has Occurred

Every day the League client loves to spam me with "An Unknown Error has Occurred." It's not just once. The client will completely break, and after 5-10 minutes of not being able to do anything, I will get 40+ Unknown Error messages. It's been going on for months. I've tried contacting support, I've tried reinstalling, running the repair tool. Always Unknown Error and losing LP due to "dodging" in Champ Select, but I can't even select a champion due to the client.