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One reason could be that the car has had a replacement windscreen fitted at some point and that the rain sensor in the windscreen has either not been reconnected, damaged or not refitted properly.
Thats probably the best place to look at. It may need a new sensor fitting....
Oh and welcome to the forum.
Currently in dave_mezza2006's garage:
2014 Vauxhall Astra Limited Edition 1.4 16v VVT Turbo