Failed to connect to host

Okay, this just started to happen to me last night. Every time i get into a game I load in I play for about a good 30 seconds to 1 minute then I freeze. Nothing happens then I get this message saying that I "Failed to Connect to Host." This is very frustrating for me. I use a router and two people are on it but I can play league and the other person can play league at the same time with no problems. So, i don't know can someone help me please!