[Champion Select] Error selecting your champion glitch

What happened: I wanted to ban fizz but since the client is so slow i always pick Aatrox so i don't get kicked out while i try my best in finding fizz though the search option. Just at the last second i got to fizz, clicked on it and pressed "ban". Suddenly an error appeared "Error selecting your champion". I'm like, ok, at least i banned Aatrox. People choose their champions and then it's my turn. Would you see, i had Aatrox chosen even though i banned him. I clicked "Lock in" to see if it worked or not and again "Error selecting your champion". Fastly i go pick Kindred, lock in and "Error selecting your champion". I got kicked and now i have to wait...