Triumph doesn't know why either. Dropped my bike off yesterday for the 3rd time to correct this issue. They had it 3 weeks last time, ended up replacing the throttle bodies, but that didn't help. They ran all the diagnostics and found nothing wrong. Ladies, I've been following your ride report and absotulely love it! I bought the Tiger to do trips exaclty like yours. I would hate for you to have to cut your trip short because of this issue. But Triumph does not have a fix for this, hoping you get home safe.