Honda odyssey keeps turing off?

I have a 2006 Honda Odyssey and it keeps turning off as if there is no battery left. Im thinking thats what it is because it will turn on one day and then the next day it wont? And also the left door wont cloes its an automatic door closer so i dont even know what it could be. The car has about 94k miles so its pretty good. I ve never had this problem with this car but i need it fix asap

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