Join Date: Jul 2005
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The tailgate switches are prone to water ingress. This quite often shows up as not being able to unlock the tailgate.
It could just be the moisture "shorting" out at the moment which is causing your false alarm.
I think it is a fairly straightforward job to prise out the switch mechanism and clean the contacts and spray with wd40.
If you try a forum search for tailgate not unlocking or can't open boot etc you should find quite a bit of info. It may even be on the Laguna FAQS section.
Currently in SportTourer's garage:
2010 Laguna III SportTourer Initiale Tom Tom.