Man I hope you get it straightened out. I've been on pins and needles waiting on today to test my new units. I did everything I could think of to not have any problems, from the battery foward. It was a lot of work to rerun everything, but it paid off. They worked flawless with no interference what so ever.
So hang in there, you or Garmin one will get it fixed. If I can be of any help, just give me a holler.