Hello, I have an older Roku player. It still works great, but just found out last night that it no longer supports Hulu. I hate to upgrade devices if they are still working/not broken. Just seems like a huge environmental waste not to mention costly.
We would recommend following the steps provided by @renojim first.
If you are not able to find any upgrade offers available to you, we would be happy to see what we can do to help get you back up and running. Please feel free to send me a PM with your Roku account email address and the serial number of your Roku device (printed on the side/back of the device) and I'll have our support team reach out directly to assist you further.
I am having the same issue, but with the Youtube TV app. It was working last week, and now it keeps kicking me out whenever I select a channel or show. I have tried to uninstall the Youtube TV app, reboot the Roku and reinstall the app but it still keeps kicking me out and returning back to the general Roku home screen. The Roku has worked perfectly otherwise so I hate to upgrade and create more waste.