Hi @conor0460,
Welcome to the Roku Community!
Thanks for letting us know about this behavior with Netflix, and we're sorry to hear about it. Rest assured that we'll assist you with this. Since you have already taken some wonderful troubleshooting steps to resolve the issue, we would recommend doing a proper clean uninstall of the Netflix channel to get the best results.
Make sure to remove the channel first, then restart your Roku device from Settings > System > System Restart. After this, add the channel again and see if that solves the issue.
Keep us posted.
All the best,
Kash
Takashi O.
Roku Community Moderator