Game files go missing all of a sudden

Dear Riot. With due respect and honor i wanna tell you that sometimes after playing a match the game files goes missing but sadly I don't get any warning about it but when i start another match and at loading screen...the loading fails with an error like " essential game files are missing and this files are mainly champion files" and when i try repair it dosent work and then after trying to log out and login constantly to fix the problem i i sometimes luckily get a messege from client that data is corrupted and repair is needed...and then it takes 15 minutes to repair league....but what the most irritating part is....im getting leaver buster ban each time and am spending time on low priority queue for the next 100 mins....i truely love this game and been playing since season 2 and i dont wanna quit because of this reasons....please help with this issue because if i get any more low priority because of technical issues...i dont think i will be able to go on with league :( .....my email is [email protected] please contact me if you guys need any further info...would appreciate your help alot.