Ever since the preseason started, my game has become quite buggy and choppy

My champions will walk in slowmo animations but at full speed at random times, auto attack animations will not cancel, but instead the last frame will be held for about a second after. Some abilities (mostly Aatrox's W) will fly to max range instead of stopping when it kills a cannon minion. I dont know what could have cause this but i feel like it has something to do with all the new shit being added in preseason and the new client is probably a factor too (i dont know how, but this thing is such a buggy POS that i dont doubt it). This isnt an issue of lag, ive changed my settings from max to the lowest and all that changed was how the game looked. Not how it played. I wanted to know if anyone has this issue, has had this issue or just has an idea as to how to fix it!