Cannot reconnect while in game

I dont get a lot of disconnects but my router restarts every time i start playing lol.And when it happens it does not reconnect me in game, so i need to force close lol and start it again.Well it would not be such a big problem if lol would start up very quickly,but it takes more than 2-3 mins just to close and open again.Is this possible to fix(if it isnt already) because in those 2-3 mins the enemy player can get stronger than me.
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