Welcome to the Roku Community, @JGD1!
Thanks for letting us know about your trouble with one of your Roku Ultra's since it would drop your Hulu profiles. Help is here.
Please check if an update is available on that specific channel by highlighting the Hulu channel, pressing the star button on your Roku remote, and selecting Check for updates.
We would recommend trying to see if that resolves your issue. Please keep us posted.
All the best,
John
John
Roku Community Moderator