I experienced this several times now when flying a very long STAR (STAR option ticked).
At the STAR entry waypoint, still on center frequency and before my TOD, I am cleared to descend and to final at pilot's discretion. A few minutes later I am told to switch to the same center frequency I am already on. After that I get the same approach clearance again. That recurs several times, every few minutes. I never get handed off to approach but do receive continuous speed restrictions when closing in to the destination and can contact tower for landing.
Thanks for looking at this.
Ralf