Random Battery Drain on 15 plate Fiesta

Joined
26 Feb 2005
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Gwynedd
Country
United Kingdom
Since we bought it in November we have had random dead battery problems. No obvious pattern, but have had a flat battery maybe 6 times in 7 months. Sometimes it just happens overnight, sometimes when its been parked up for a day or more. Most of the time its just fine.

I am aware of parasitic drain, and testing for it, but does anyone know why it can be so random? Garage has had it back a couple of times, not finding the issue. They replaced the battery, to no avail. You'd think that if something was faulty, it'd be faulty all the time.
 
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Worth checking boot light switch might not be operating and leaving the boot light on sometimes. I assume the cooling fan is not running on as you would hear it. Glovebox light is another possible culprit.
 
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