[CRASH] Help asap, its getting anoying -_-

The game freezez in a random moment, ping goes to 500 and its reconnecting. Its not my computer or my internet becouse I tried it on multiple computers and internet connections. This happens often on ARAM abyss... After that I try to reconnect, but with no luck. I tried everything, from rebooting the computer to stopping lol services... No luck. When I finnaly can press the reconnect button, the screen is black. After the match is over I get a leaver buster penalty. It did that for 2-3 times now, and since I dont have alot of time, its just anoying. Please fix this :)

-Domzy0rgon