I have a 2008 GL450 with the Navigation system. I am still using the original disc. My system has erased all saved destinations twice, including the Home address. The first time I thought one of my kids was messing with it and erased it all by mistake. The second time it happened I was the only one in the car and I know I did not erase anything. I brought the car to the dealer and had the system checked out. The dealer has never encountered this issue and could not find anything wrong. Inititally I thought that updating to the newest disc might solve the problem, but I assume that these saved destinations are stored on a hard drive and not the actual disc. Has anyone experienced this issue? Any known fixes? Thanks.