Thanks for reaching out here in the Community!
Does the issue only occur on a specific channel or across other channels installed on your Roku device?
We would recommend removing the channel from the Roku home screen by navigating to the channel tile, pressing the * key on your remote, and choosing 'Remove channel'. Then restart your device from Settings>System>System restart. Once your player starts up again, add the channel back once more.
To help troubleshoot the issue further, follow this link: How to resolve a channel playback issue
Please keep us posted and we'll continue assisting you from there.