Is it happening with every channel on your Roku, or only one or two? If it's only certain channels, then it's not likely a Roku issue. Remember that Roku does not create the channels you are using for those providers. And the apps on other devices are written in a completely different programming language, so you can't compare how they work on different devices.
If only those channels have issues, you need to contact the provider of the channels. In your case those channels are developed by the providers, so the first place to check is their web sites for product support.
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.