Punishment for afk

I have a problem. We moved into a new house 2 months ago and in this new home I get a power failure now and then which means that I instantly disconnect from the game and to turn the power back on takes atleast 5-10minutes, another 10-15mins for the router to load up again. Of course I get my report nearly every 3rd game now and so I got punishments for 20mins to join a queue each game now. Why does Riot punish for so long? If someone is an Afker, he probably goes afk during the 20min before he has entered the queue. I´m trying to say this punishment doesn´t help and it is clearly just there to annoy you.
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