LP Lose cause Riot crashed my PC???

Today i lost 15 LP cause i got afk in a round. In my opinion it not fair at all that i lose any LP when riot cant fix theire game and it crashed my PC. I just died at min 3 against a Xerath and in the moment I died my PC crashed. HAd to restart 2 times and then i had to repair LoL which was like 2GB downloading. Eventhought i have 15MB/s i came back at min 20 and obv we lost. Can you fking fix your game or gie people the LP back which lose it cause of YOUR bugs.