Is there a way to get a leave caused by a 3-5 minute disconnect removed?

My connection started spazzing and the game ended quickly since we already had a player who had disconnected before the match started. If not that is fine, just hate to have a non-genuine leave.

I don't think so, I've asked Riot and they told me there was nothing they could do about it. All of my leaves are from disconnection, so I understand it's lame.

I've been disco'd a couple times...never received a leave from it.

You could try and email Riot at support@riotgames.com and see if they will do anything about it, but chances are you are probably stuck with it.