Game crashes before loading screen pops up

Haven't been able to play for about two weeks now because of a client bug. Most people are reporting that their loading screen freezes, but I think my issue is different. After champ select my client will kind of freeze for ~4 seconds, then minimize like it's going to open the loading screen. I hear a windows error sound, and then the reconnect screen pops up. Haven't been able to find a fix after doing a lot of googling, would appreciate any help.