Random dc while oppent left

I was playing a game of wl and was up 3 0 my oppenent paused and quit the game. 

After he quit and i got a message about him quiting and pressed a to continue randomly a dc from my and popped up and forced me to leave.

When relogging into ut i got the dnf message when opening my champs agian i saw i got a win and los i even have this on video.

Any one else has had this problem?

Ea maybe a reslove would be great give me a game back.

Could provide even more proof if needed