I also am getting ads on Amazon prime. These are interrupting shows that are playing. I pay for ad free programing and this is distressing.
I've never seen an ad interrupt something in progress, only a leader ad before the video starts. However, it's being reported that Amazon has added their IMDB streaming to the Prime Video channel, and if the title isn't a Prime offering, or something you have purchased, there can be ads. So you get more titles to watch for no additional charge, but you get some ads with them. I'll have to look closer next time I'm in Prime Video, but I would expect it's marked in some way that the title has ads. You'll just have to be more careful in the titles you choose to watch if you don't want any ads.
Roku Community Streaming Expert
Help others find this answer and click "Accept as Solution."
If you appreciate my answer, maybe give me a Kudo.
I am not a Roku employee, just another user.