Could be that the battery has reached end of life.. The D3 is very sensitive to a battery that's starting to die. When it's pretty much done, you'll get regular occurences of this until you replace it.
Might be worth getting one of those booster kits just in case you get stranded, but it's usually a long stop that it does it over rather than an hour or two.
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2010 Jag XF 3.0D Portfolio S
I know.. I know..
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