03 996 C4S. I noticed my clock was a little slow so went to change the time. When I got to the menu in the PCM it stated it was in GMT summertime which was +1 hour 8 mins, strange as should be just one hour. I reset to one hour changed to the correct time and saved the settings. After about 5 mins the clock jumped forwards another 8 minutes. When I checked the date and time again it showed GMT summertime +1hr 8 mins aagain. Any ideas.