Hi, My daughters Clio had the same problem, sometimes it would fire up and start like a button, other times it wouldn't start at all. Bought new starter motor, still same problem, bought new battery,same problem. Took car to garage got charged £35 to tell me they couldn't find any fault on their computer. Fixed problem by taking key fob apart and cutting out a piece of cardboard(off cornflakes box)and fitting it into the cavity opposite the battery side of the fob and sliding back together the fob so everything was held firm inside the fob. Hey presto no problems since. Also done the same thing on spare key, everthing has been working normally now for three weeks.Hope this helps someone before spending on car as i did.
STRYKER,MERTHYR TYDFIL>, May 2010