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Sounds like an intermittant fault with the reverse switch, as you suspect. It is indeed located on the gearbox.
For the sake of a few quid it is probably better to replace the switch than try to clean the old one up, depends how badly corroded/worn it is when you get it out, but easier just to replace.
Currently in SportTourer's garage:
2010 Laguna III SportTourer Initiale Tom Tom.