I used to be able to Miracast my old ZenFone 5z with Netflix and Amazon prime then when the pandemic hit in Australia the ISP,s I think must have done something as their were so many people working from home and all of a sudden only the audio worked but not the visual. I'm not sure if my old ROG 3 was the same or not I don't think I had it for long enough to try .
I checked today and it's back to normal both AV work again with Netflix and Amazon prime.
I don't know enough about bandwidth usage but I believe it had something to do with it . I'm curious if anyone knows the reason