Random 300+ Ping Until Restarting Laptop? Why?

Because of this ongoing issue I have been having - I have had to leave games quickly to restart to get better ping. But by that time, people have either surrendered, lost, restarted the game, or even won when I came back and played, and still lose LP. I have had two Leaver Busters already for something that Isnt even my fault.. My Wifi is fine. I check Speed tests and it says It's fine, enter the game and nope. My laptop works fine. I have 0 clue what is going on. I need help :/
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