Why me

So I have played through bronze 1 promos all the way through silver 5 promos with several ARURF matches in between with absolutely no issue but as soon as I attempt my first silver 5 promo it takes just a little while longer than normal to load, and then suddenly I get hit with the leaverbuster notification overlapping the loading screen. Twenty minutes for five matches and a loss for my first promo.

Sure you can say my internet sucks or my computer sucks or whatever you want to say about me being bronze but I don't feel like this is warranted or normal since I've played all week so far with no problems. That's cool. Is this the right category? https://imgur.com/a/RWBj4Wx