Woman driver I have to exactly the same problem with same car similar mileage but 08 reg.It has been happening to me for about a year and I have had it into the garage a few times ( not a Citroen garage) but to no avail It is totally random and doesn't make any difference if it is a long or short journey. We are currently on holiday and will have driven about 800 miles by the time we get home. I did posts question on hereabout a year ago but haven't Ben able to find it so that you can see the answers but will keep trying. I just keep on driving.