I agree— this only started happening on both of my Roku 2XDs a month or so ago. It’s only happening on Prime, not on Netflix, PBS or any other streaming source. Since we watch a lot of Brit shows and my partner especially has difficulty with the audio on those, it’s making watching these extremely difficult.
ive tried many of the suggestions made already to no avail.
I am now more convinced this is a Prime problem. I get delay when watching Prime Video movie on the Roku but also on Chromecast and on Smart TV. Lots of people complaining on the Net with things like Xbox.
Roku support went through the motions with me. I am hoping that they might communicate with Amazon.
It's not only on Prime. Some (not all) programs on other apps are out of sync too. On the Roku channel, for example, The Barbara Stanwyck Show was in sync when I started watching in October, but it went WAY out of sync a couple of months ago and has stayed that way. Movies on various channels, like TCM or Criterion, may or may not be in sync. But yes, Prime is consistently the worst. Maybe Amazon is trying to run Roku out of business.