Thanks for posting here in the Roku Community, JCfromJC!
We appreciate you reaching out to us about the issue you're encountering with the Sling app, which only buffers when streaming live TV. No worries; we'd be more than happy to help you with this.
You may try the troubleshooting steps below to see if that resolves the problem you're experiencing.
- Remove the channel: Highlight the channel tile on your home screen and press Star to open the Options menu. Select Remove channel and confirm.
- Restart your Roku device: Go to Settings > System > Power > System restart > Restart Now.
- Re-install the channel: After your Roku device restarts, visit the Roku Streaming Store and add the channel again.
For more troubleshooting tips, visit this support article: How to resolve a channel playback issue.
We hope this helps. Let us know if you need more assistance.
All the best,
Emman