I guess no-one has had a similar problem. But it's getting worse. As well as the previously mentioned occurrences, the wipers started to cycle once during the "episode". There are no fault codes ( garage cannot find the problem source ) so I tried a simple "re-boot" by disconnecting the battery, waiting 30 minutes and re-connecting. It did not cure the problem. But more issues have arisen. Now, the alarm keeps going off for no apparent reason, and the DAB radio ( plugged into the AUX on the radio ) has stopped working - although the radio / satnav / CD all work fine. If it's a processor, I would have thought that a code would show. Anyway, it's driving me nuts.