[Client] Bug problem with receiving invite

My fiance and I have a bug invite thing going on every time, it's just both of us playing. Whenever he creates co-op lobby of his own, I get the invite but there's also only a notification that shows up and by the time I click to it, it either boots me out or the invite was put on hold. And he's already in the lobby picking out his character. It's been happening for almost 4 days in a row every time he sends me an invite and it also happens with our other friends from our friends list.. Is there any way this issue can be resolve? That's just my problem with our game play on League of Legends. Hopefully it gets fixed. Thank you