Dropping our of gear?! Very scary!!

I've owned a 2002 1.2 Clio for a out 2 months now. Recently when on the motorway it's dropped out of 5th hear causing the revs to go through the roof and some hairy moments at 70!!


It goes back into gear okay, but then it'll happen again. It isn't a very regular occurrence but I've never had a car do this before!!


Does anyone know what it might be?

Thanks.

Dropping our of gear?! Very scary!!