There is something wrong with my lol client.

Whenever i am in a premade queue with my friends, they all get the option to accept and decline except me and i continue to be in queue. I am also getting penalized for this. Another time when i was starting a ranked game, i was able to get into champion select but i could not see the bans and what my team mates were picking and later i got kicked out of champion select. I tried re installing league, updating graphics card, repair league but none of those options worked. Is there a fix for this problem? Is it something to do with my internet? How can i resolve this issue?