On my roku express 4k the youtube channel keeps signing me out. I sign in. It works for that session. I turn off the TV and come back the next day and I am signed out again. Sometimes it happens several times a day. This only happens on this one roku device. My other device (Roku II) works fine. How can I fix this?
I've never encountered that, so it's something specific to that specific player. The first step to try with channel issues is to remove the channel from the device, reboot the device (critical step, don't skip), then install the channel again. You will need to log in again of course, but hopefully that will resolve your issue.
Before you remove the channel, power off your other Roku players so they don't uninstall the channel. Once you've added the channel back into the Express 4K, you can turn them back on.
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For more information about that channel's authentication and functionality, you'll want to contact the channel provider support directly to inquire further. Many channels on Roku are developed and maintained by the channel provider themselves.