I am having an issue with getting the car to use LTFTs. This has been going on for about a month. I flashed it yesterday and all worked as it should and since all seemed to work as advertised, I made a minor change, flashed the car and they were not working again. I went back to the previous working tune with no success. I drove the car for about a hour with a lot of highway use so there was ample time for it to repopulate. Has anyone ever had this issue before? The O2 sensor are new Bosch units.