It happened to me with both providers I mentioned. With Frontier, it's when they bought Verizon FIOS, and I lost several movies. On Amazon Prime Video, I lost 2 seasons of a British detective show.
If it’s happened to you please call customer service and complain. If they can’t fix it or refund you, please get in touch with me and I will try and get it fixed for you
https://www.slashfilm.com/574053/amazon-sued-purchased-movie...