Is the "security" light on? If so, then take your key to the dealer and have it checked. They should check it for free.
If it is not on, then I would start with checking the battery terminals and cables, making sure that they are completely tight, on both ends. You likely just need to clean and tighten them. If you see any greenish/whitish gunk on the terminals, then take the terminals off and clean them with a pipe cleaner, sandpaper, or something along those lines and reconnect them. Make sure that the connections are tight enough that you cannot move the cables by hand.
Start there and let us know.
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Wednesday, November 15th, 2017 AT 2:41 AM