A friend of mine had the same issue. Kept his keys on him at all times. Every time he got within X yds of car it would unlock and then lock again as he moved out of range, this could happen 20 times a day. As the fob and car are always on the lookout for the other. He now puts the fob in one of those fancy covers you can buy to protect your credit cards to block it from being read ( also available to put car fobs in). It does seem to have slowed the fob battery loosing power so quickly.
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Current, XC60 AWD D5 SE DRIVe
1st motor. Austin A35, indicators and heater optional.
Not forgetting RTFM
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