I have a Roku Ultra LT using the wired ethernet connection ...
Today (10/12/2021) Accuradio appears to have a problem ... When I select it from the Home screen, it seems to attempt to load it, showing the initial splash screen but then it flips back to the Home screen
Did you restart your Roku device before re-installing the channel? That step is crucial when performing the troubleshooting. If you haven't tried the suggested order (remove > restart > re-install), we would recommend giving it a shot once again.
For clarification, did the issue get resolved on your Roku Ultra LT? If so, try doing the same thing on your Roku Express 4K. If the issue persisted, contact the channel provider's customer support team to report the issue and get help.
Channels on Roku are maintained by the channel developer themselves. In this case, there's likely an issue within that specific channel that needs to be addressed with an update from the channel provider.