My GT started shutting down between down shifts or when coasting to a stop. No trouble restarting, it starts right up. This started after about 200 miles into a trip. This was happening about 8-12 times a day on this trip. I called my SM and he said to make sure I was using good gas with the highest octane number I could get. When I got to Chicago I called Chicago BMW and the SM said he would take a wild guess that it was a throttle/EFI mapping problem. He stated that anytime the battery is disconnected on these bikes that the throttle mapping needed to be accomplished. He told me how to do the procedure and I did it. This improved the situation but did not fix it. I am home now and do for the 12K service. My trip was 7285 miles, 19 days, i9 states from Florida to California and back. Best MPG were in Utah/Colorado with 87 Octane non ethanol fuel. I actually got 54MPG there. One other 1300GT owner on another forum is having the shut down problem and he has less than 600 miles on his bike.
Any ideas appreciated.