There is a programmed power shutdown for non-essential circuits if the car isn't used for more than 3 days (I think). I was away for 2 weeks and found that I couldn't get in with the remote. The way to re-activate is to unlock the driver's door with the key, holding it in the unlock position for 2-3 seconds. Then lock it again with the remote. Then unlock it with the remote to clear the immobiliser and all should be OK. (This worked for my UK car and I hope it's the same for yours).
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