Your opponent has left the match problem

I can’t play a single match since yesterday. At first, the problem is nothing but a nuisance. I can just find a couple match more and play the game. 

Now it’s completely different. I cannot find a single opponent. I cannot play the game anymore. Others mode are fine just the rivals and champions.

I already check my NETWORK CONNECTION so please don’t tell me to check my routers and stuffs. I already tried a lot of methods that I found on the internet. There are also a lot of people who has been in same problems as me for months. 

please guys fix the problem.