I'm getting same issue with one app on my Roku Stick + (Broadway HD). Lip sync is fine to start with but within a few minutes it starts to go out until its unwatchable. It only affects this app. I've tried everything - re-installing the app and other methods described above but nothing works . This only started happening after the latest Roku software update on my stick +. I've informed Broadway HD who are looking into it but since it started after latest Roku update I'm thinking it's a Roku issue . Really annoying as I pay a subscription to Broadway HD and in the UK using Roku is the only way to watch it on my Sony Bravia TV.