Can you like...Fix your trash client please?

Randomely whenever i enter a game i have a random chance to have this bug where i can drag my mouse to the bottom of the screen in game or my task bar will pop up and it will tab out of league, NO MATTER WHERE I AM, I got invaded by a lee sin while the client was tabbing out and that was it, i couldve escaped if the client wasnt tabbed out and i can see the ward i placed in the river, but nooo. You had to make such a buggy and shitty client...THE ONLY CLIENT, i want my legacy client back, because the one youve made, is entirely unsuitable for people who play on pcs that arent $500, and even people with amazing pcs still get these bugs, clearly it was a bad idea, but you guys are so fixated on making league "up to date" and "fancy" that its fucking over your players