When Riot Gives you the Finger

Played one game and everything was fine. No one dc'd and there were no glitches or anything. I won that game but a loss prevented put up meant I only got 11 lp. NEXT GAME immediately after our mid laner dcs and can't log in for the first 7 minutes because of log in times. During this time the enemy pretty much takes over our jungle and kills our jungle several times. The enemy just snow balls out of control and we hard lose. Lost 18 lp because riot turned off loss prevented or something. My lp gain isnt because of a crap mmr because I usually get 22 points at least per win. In the long run it's not that big of a deal but seriously? Wtf