This. Mine had been good ever since until today.Mine was out today too. I was just coming here to report that. I received no errors on the vehicle; the option for UHF simply wasn't there. I tried engaging it, and it gave me an error of "UHF not available on this road", even though I have used it on that road yesterday.
Additionally, it was acting a little goofy yesterday. Not available in small pockets of the road; didn't engage when I tried, but a reset fixed it.