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Bit hard to say. It's always late at night (midnight and 2am)
Only happened twice, while parked at home, was away for a week and it didn't happen there. So could be environment (it's a bit close to a bush, but has been forever)
Or it could be genuine
moocher-
Stupid answer, is it aftermarket or oe fit? Could try charging the battery off the car.
Seems modern cars don't like voltage fluctuations. My Mondeo had that issue of internal alarm battery getting old and occasionally setting alarm off. Replacement of battery in the module was easy but took a bit of work and stripping to get to the module.
Overuser155208
Is it a certain time after the car has been used? Or has the car not been used for days?