I have been having a problem with satellite radio and nav. The satellite keeps going on and out and and get a "check antenna connection, take vehicle to dealership...." error. No rhyme or reason when it happens or for how long. This last time has been for several days. Alomg with the satellite, the nav shows us on the wrong location. I would assume the antenna is used for both, but sometimes when the satellite radio isn't working, nav is. Called the dealership, noone there has ever seen or heard of the problem. Anyone here experiencing the same problem?