Player since season 2 Client has taunted me since

I have played this game for 6 years and I cannot take this anymore. I love league of legends, I have spent over 500 dollars on my account and have played something like 1800 hours over the last 6 years. Unfortunately, my client is so buggy that I have frequently gotten LeaverBuster games every week almost since I downloaded the game. I almost never over the last 6 years "ragequit". I would say that 95% of the time my client bugs with the transition from champ select to in game. Please help me so I can continue to play the game I love without forcing my friends to wait on me for 20 minutes.