[Bug?? I think] Game crashes once a day after a beeping noise.

Once to twice a day, while in a game, (aram, twisted treeling, Summoners rift) two windows beeps occur and the game freezes. When it freezes I can not tab or open task manager and have to sign out and restart my PC. This ruins my ranked experience and everyone on my team. I heard it happened exactly the same with someone else and it is really bugging me out. I re downloaded league several times and even used the initiate repair button. It happens randomly during a game and Its very frustrating to deal with. I run a gtx 1080 from Strix and a water cooled system with an I-7 8700k so it is probably not my system being too broken. If anyone else is presented with this problem, please reply.