Apple TV app buffering every 15 minutes on Roku TV

I have a Roku TV. Just subscribed to Apple TV. It now buffers every 15 min. It buffers then plays and buffers for two minutes then goes back to streaming. This after 15 min of watching it repeats again. My internet is strong and all my other apps never have that problem.

[Re-Titled by Moderator]

Original Title: apple tv app buffer