Thanks for the posts.
Does the issue only occur on Hallmark or across other channels installed on your Roku device? Did you restart your player before re-installing the channel? That step is crucial when performing the troubleshooting. If you haven't tried the suggested order (remove > restart > re-install), we would recommend giving it a shot once again.
For detailed instructions, refer to this Support link: How do I resolve channel playback issues?
Let us know how it goes!
All the best,
Roku Forum Moderator