[client] Connection issues

I enjoy playing league, I'm not good at it but I still play it but not when I get disconnected randomly for a few days at a time. I get an error at the start of loading in to a game then it says 'You have disconnected. Check your network connection' yet every other game on my PC works fine then when I try reconnecting it comes up with 'An Unknown DirectX error occurred check your network connection or game drivers'. It used to be my anti-virus quarantining a program but I've fixed that and it worked fine until the new UI change and I don't know what to do. Reinstalling the game doesn't work Btw.