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This is a common problem with Laguna's (and Clio's). I think your problem will be down to a connector under one of your seats - possibly the passenger one.
If you do a search on the forum, you will find losts of threads on this and with possible fixes.
Currently in dave_mezza2006's garage:
2014 Vauxhall Astra Limited Edition 1.4 16v VVT Turbo