NEED HELP! Game keeps reverting to old patch?

I recently got back into playing league. Every now and then,**** my game will revert to an old patch**** and i am**** forced to download a 1.6 gb update**** before I can play again. This takes me around 3 hours every time since the internet at my new place is pretty horrible. It has happened 3 times over the past week and is extremely frustrating when I have limitations as to when I am able to play. ****Any one else having this problem? Rito pls help**** {{summoner:31}}
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