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Yes, this was a common problem on earlier Laguna Sporttourers.
It is due to water ingress in the switch mechanism,causing the contacts to corrode/get dirty.
You need to prise open the rubber cover to see the switch, clean the contacts ( if not too far gone) & spray with wd40.
Later models have been modified to prevent this happening.
If you do a search on here, there is a more detailed description of how to clean the switch.
I haven't got time to search for you myself at the moment to find the link for you,sorry.
Currently in SportTourer's garage:
2010 Laguna III SportTourer Initiale Tom Tom.