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I suspect the problem is low battery voltage. The car has a 'power management' system and the combination of cold weather and use of electrical loads may have caused low battery voltage. The object of the system is to try to ensure sufficient battery voltage to start the vehicle. Annoying as it is, I'd rather have a car that will start rather than have a fully functioning heated front screen. A long run or an overnight trickle charge may cure it; personally I'd just wait for the weather to get a bit warmer.
 
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