Thanks for letting us know about the issue you're experiencing.
For channels crashing to the home screen, we would recommend removing 2 of the affected channels then re-install them back in. To ensure the process is successful, follow the steps below making sure you restart your Roku device before adding the channel again.
Remove the channel: Highlight the channel tile on your home screen and press the Star button to open the options menu. Select Remove channel and confirm.
Note: If you are removing a subscription channel billed to your Roku account, you must cancel the subscription before you see the Remove channel option. For help identifying this type of subscription channel, read the detailed article about removing a channel.
Restart your Roku device: Restart the device from the settings menu. Go to Settings > System > System restart > Restart.
Re-install the channel: After your Roku device restarts, visit the Roku Channel Store and add the channel again.
Note: If you are adding a subscription channel billed to your Roku account, you will need to resubscribe.
Has this issue been solved? I have a brand new 65" Samsung and brand new Roku Ultra. I have attached the two with a top-of-the-line HDMI cable. Every night the TV turns on, which only happens when the Roku is connected. I have the latest firmware for both the TV and the Roku devices.
4800X - Roku Ultra, Software 10.0.0 4209-C2
The screensaver was set to 10 minutes and the theme was the fish tank.